diff --git a/apps/desktop/src/app/app.component.ts b/apps/desktop/src/app/app.component.ts
index 6445789ede0..08ebab94637 100644
--- a/apps/desktop/src/app/app.component.ts
+++ b/apps/desktop/src/app/app.component.ts
@@ -63,6 +63,7 @@ import { PlatformUtilsService } from "@bitwarden/common/platform/abstractions/pl
 import { StateService } from "@bitwarden/common/platform/abstractions/state.service";
 import { SystemService } from "@bitwarden/common/platform/abstractions/system.service";
 import { ServerNotificationsService } from "@bitwarden/common/platform/server-notifications";
+import { SSO_COOKIE_VENDOR_CALLBACK_COMMAND } from "@bitwarden/common/platform/services/server-communication-config/server-communication-config-platform-api.service";
 import { StateEventRunnerService } from "@bitwarden/common/platform/state";
 import { SyncService } from "@bitwarden/common/platform/sync";
 import { UserId } from "@bitwarden/common/types/guid";
@@ -839,6 +840,12 @@ export class AppComponent implements OnInit, OnDestroy {
 
   // Process the sso callback links
   private processDeepLink(urlString: string) {
+    // Handle SSO cookie vendor callback
+    if (urlString.indexOf("bitwarden://sso-cookie-vendor") === 0) {
+      this.messagingService.send(SSO_COOKIE_VENDOR_CALLBACK_COMMAND, { urlString });
+      return;
+    }
+
     const url = new URL(urlString);
     const code = url.searchParams.get("code");
     const receivedState = url.searchParams.get("state");
diff --git a/apps/desktop/src/app/services/services.module.ts b/apps/desktop/src/app/services/services.module.ts
index d585e8a595f..a82c42a8519 100644
--- a/apps/desktop/src/app/services/services.module.ts
+++ b/apps/desktop/src/app/services/services.module.ts
@@ -111,7 +111,7 @@ import { NoopSdkLoadService } from "@bitwarden/common/platform/services/sdk/noop
 import {
   DefaultServerCommunicationConfigService,
   ServerCommunicationConfigRepository,
-  NoopServerCommunicationConfigPlatformApiService,
+  ServerCommunicationConfigPlatformApiService,
 } from "@bitwarden/common/platform/services/server-communication-config";
 import { SystemService } from "@bitwarden/common/platform/services/system.service";
 import { GlobalStateProvider, StateProvider } from "@bitwarden/common/platform/state";
@@ -589,13 +589,29 @@ const safeProviders: SafeProvider[] = [
   }),
   safeProvider({
     provide: ServerCommunicationConfigService,
-    useFactory: (stateProvider: StateProvider, configService: ConfigService) =>
+    useFactory: (
+      stateProvider: StateProvider,
+      platformUtilsService: PlatformUtilsServiceAbstraction,
+      messageListener: MessageListener,
+      logService: LogService,
+      configService: ConfigService,
+    ) =>
       new DefaultServerCommunicationConfigService(
         new ServerCommunicationConfigRepository(stateProvider),
-        new NoopServerCommunicationConfigPlatformApiService(),
+        new ServerCommunicationConfigPlatformApiService(
+          platformUtilsService,
+          messageListener,
+          logService,
+        ),
         configService,
       ),
-    deps: [StateProvider, ConfigService],
+    deps: [
+      StateProvider,
+      PlatformUtilsServiceAbstraction,
+      MessageListener,
+      LogService,
+      ConfigService,
+    ],
   }),
 ];
 
diff --git a/libs/common/src/platform/abstractions/server-communication-config/server-communication-config.service.ts b/libs/common/src/platform/abstractions/server-communication-config/server-communication-config.service.ts
index 63a60a57d70..674ed724616 100644
--- a/libs/common/src/platform/abstractions/server-communication-config/server-communication-config.service.ts
+++ b/libs/common/src/platform/abstractions/server-communication-config/server-communication-config.service.ts
@@ -29,4 +29,14 @@ export abstract class ServerCommunicationConfigService {
    * @returns Promise resolving to array of [cookie_name, cookie_value] tuples
    */
   abstract getCookies(hostname: string): Promise<Array<[string, string]>>;
+
+  /**
+   * Initiates cookie acquisition flow for the specified hostname.
+   * Opens browser for user authentication, then captures and validates cookies.
+   *
+   * @param url - The server url requiring cookies
+   * @returns Promise that resolves when cookies acquired and saved, or rejects on error/cancellation
+   * @throws AcquireCookieError on validation failure or cancellation
+   */
+  abstract acquireCookie(url: string): Promise<void>;
 }
diff --git a/libs/common/src/platform/services/server-communication-config/default-server-communication-config.service.spec.ts b/libs/common/src/platform/services/server-communication-config/default-server-communication-config.service.spec.ts
index f2b61d8cab7..4ba258b296f 100644
--- a/libs/common/src/platform/services/server-communication-config/default-server-communication-config.service.spec.ts
+++ b/libs/common/src/platform/services/server-communication-config/default-server-communication-config.service.spec.ts
@@ -21,8 +21,10 @@ jest.mock("@bitwarden/common/platform/abstractions/sdk/sdk-load.service", () =>
 
 // Mock SDK client
 const mockClientInstance = {
-  setCommunicationType: jest.fn(),
+  needsBootstrap: jest.fn(),
   cookies: jest.fn(),
+  setCommunicationType: jest.fn(),
+  acquireCookie: jest.fn(),
 };
 
 jest.mock("@bitwarden/sdk-internal", () => ({
diff --git a/libs/common/src/platform/services/server-communication-config/default-server-communication-config.service.ts b/libs/common/src/platform/services/server-communication-config/default-server-communication-config.service.ts
index 8348cc756ca..41ce4e8a87f 100644
--- a/libs/common/src/platform/services/server-communication-config/default-server-communication-config.service.ts
+++ b/libs/common/src/platform/services/server-communication-config/default-server-communication-config.service.ts
@@ -66,4 +66,13 @@ export class DefaultServerCommunicationConfigService implements ServerCommunicat
   async getCookies(hostname: string): Promise<Array<[string, string]>> {
     return this.client.cookies(hostname);
   }
+
+  async acquireCookie(url: string): Promise<void> {
+    // SDK client handles:
+    // 1. Calling platform API (this.platformApi.acquireCookies(url))
+    // 2. Validating cookie names match config
+    // 3. Saving validated cookies to repository
+    // 4. Throwing appropriate AcquireCookieError on failure
+    await this.client.acquireCookie(url);
+  }
 }
diff --git a/libs/common/src/platform/services/server-communication-config/index.ts b/libs/common/src/platform/services/server-communication-config/index.ts
index e918d4e6301..776f312b35f 100644
--- a/libs/common/src/platform/services/server-communication-config/index.ts
+++ b/libs/common/src/platform/services/server-communication-config/index.ts
@@ -1,4 +1,4 @@
 export { ServerCommunicationConfigRepository } from "./server-communication-config.repository";
-export { NoopServerCommunicationConfigPlatformApiService } from "./noop-server-communication-config-platform-api.service";
+export { ServerCommunicationConfigPlatformApiService } from "./server-communication-config-platform-api.service";
 export { DefaultServerCommunicationConfigService } from "./default-server-communication-config.service";
 export { SERVER_COMMUNICATION_CONFIGS } from "./server-communication-config.state";
diff --git a/libs/common/src/platform/services/server-communication-config/noop-server-communication-config-platform-api.service.ts b/libs/common/src/platform/services/server-communication-config/noop-server-communication-config-platform-api.service.ts
deleted file mode 100644
index a30e1198710..00000000000
--- a/libs/common/src/platform/services/server-communication-config/noop-server-communication-config-platform-api.service.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-import { AcquiredCookie, ServerCommunicationConfigPlatformApi } from "@bitwarden/sdk-internal";
-
-/**
- * Noop implementation for SSO cookie acquisition.
- *
- * Temporary implementation, will be replaced after https://github.com/bitwarden/clients/pull/18837 merges
- */
-export class NoopServerCommunicationConfigPlatformApiService implements ServerCommunicationConfigPlatformApi {
-  constructor() {}
-
-  async acquireCookies(hostname: string): Promise<AcquiredCookie[] | undefined> {
-    return;
-  }
-}
diff --git a/libs/common/src/platform/services/server-communication-config/server-communication-config-platform-api.service.spec.ts b/libs/common/src/platform/services/server-communication-config/server-communication-config-platform-api.service.spec.ts
new file mode 100644
index 00000000000..ffb28491a0f
--- /dev/null
+++ b/libs/common/src/platform/services/server-communication-config/server-communication-config-platform-api.service.spec.ts
@@ -0,0 +1,212 @@
+import { mock, MockProxy } from "jest-mock-extended";
+import { Subject } from "rxjs";
+
+import { LogService } from "@bitwarden/logging";
+import { MessageListener } from "@bitwarden/messaging";
+import { AcquiredCookie } from "@bitwarden/sdk-internal";
+
+import { PlatformUtilsService } from "../../abstractions/platform-utils.service";
+
+import { ServerCommunicationConfigPlatformApiService } from "./server-communication-config-platform-api.service";
+
+describe("ServerCommunicationConfigPlatformApiService", () => {
+  let platformUtilsService: MockProxy<PlatformUtilsService>;
+  let messageListener: MockProxy<MessageListener>;
+  let logService: MockProxy<LogService>;
+  let service: ServerCommunicationConfigPlatformApiService;
+  let callbackSubject: Subject<{ urlString: string }>;
+
+  beforeEach(() => {
+    platformUtilsService = mock<PlatformUtilsService>();
+    messageListener = mock<MessageListener>();
+    logService = mock<LogService>();
+
+    // Create a Subject to simulate message stream
+    callbackSubject = new Subject<{ urlString: string }>();
+    messageListener.messages$.mockReturnValue(callbackSubject.asObservable());
+
+    service = new ServerCommunicationConfigPlatformApiService(
+      platformUtilsService,
+      messageListener,
+      logService,
+    );
+  });
+
+  describe("acquireCookies", () => {
+    it("opens browser to correct URL", async () => {
+      const promise = service.acquireCookies("vault.acme.com");
+
+      expect(platformUtilsService.launchUri).toHaveBeenCalledWith(
+        "https://vault.acme.com/proxy-cookie-redirect-connector.html",
+      );
+
+      // Simulate callback to resolve promise
+      callbackSubject.next({
+        urlString: "bitwarden://sso-cookie-vendor?testCookie=value123",
+      });
+
+      await promise;
+    });
+
+    it("parses single cookie from callback URL", async () => {
+      const promise = service.acquireCookies("vault.acme.com");
+
+      // Simulate callback with single cookie
+      callbackSubject.next({
+        urlString: "bitwarden://sso-cookie-vendor?AWSELBAuthSessionCookie=abc123",
+      });
+
+      const result = await promise;
+
+      expect(result).toEqual([{ name: "AWSELBAuthSessionCookie", value: "abc123" }]);
+    });
+
+    it("parses sharded cookies from callback URL", async () => {
+      const promise = service.acquireCookies("vault.acme.com");
+
+      // Simulate callback with sharded cookies
+      callbackSubject.next({
+        urlString:
+          "bitwarden://sso-cookie-vendor?AWSELBAuthSessionCookie-0=part1&AWSELBAuthSessionCookie-1=part2&AWSELBAuthSessionCookie-2=part3",
+      });
+
+      const result = await promise;
+
+      expect(result).toEqual([
+        { name: "AWSELBAuthSessionCookie-0", value: "part1" },
+        { name: "AWSELBAuthSessionCookie-1", value: "part2" },
+        { name: "AWSELBAuthSessionCookie-2", value: "part3" },
+      ]);
+    });
+
+    it("excludes 'd' parameter from cookies", async () => {
+      const promise = service.acquireCookies("vault.acme.com");
+
+      // Simulate callback with 'd' integrity marker
+      callbackSubject.next({
+        urlString:
+          "bitwarden://sso-cookie-vendor?AWSELBAuthSessionCookie=abc123&d=integrity_marker_value",
+      });
+
+      const result = await promise;
+
+      // Should only have the cookie, not the 'd' parameter
+      expect(result).toEqual([{ name: "AWSELBAuthSessionCookie", value: "abc123" }]);
+      expect(result?.find((c: AcquiredCookie) => c.name === "d")).toBeUndefined();
+    });
+
+    it("returns undefined when no cookies in callback", async () => {
+      const promise = service.acquireCookies("vault.acme.com");
+
+      // Simulate callback with only 'd' parameter (which is excluded)
+      callbackSubject.next({
+        urlString: "bitwarden://sso-cookie-vendor?d=integrity",
+      });
+
+      const result = await promise;
+
+      expect(result).toBeUndefined();
+    });
+
+    it("returns undefined on timeout after 5 minutes", async () => {
+      jest.useFakeTimers();
+
+      const promise = service.acquireCookies("vault.acme.com");
+
+      // Fast-forward time by 5 minutes
+      jest.advanceTimersByTime(5 * 60 * 1000);
+
+      const result = await promise;
+
+      expect(result).toBeUndefined();
+      expect(logService.warning).toHaveBeenCalledWith(
+        "Cookie acquisition timeout for vault.acme.com",
+      );
+
+      jest.useRealTimers();
+    });
+
+    it("deduplicates concurrent calls for same hostname", async () => {
+      const promise1 = service.acquireCookies("vault.acme.com");
+      const promise2 = service.acquireCookies("vault.acme.com");
+
+      // Should only launch browser once
+      expect(platformUtilsService.launchUri).toHaveBeenCalledTimes(1);
+
+      // Simulate callback
+      callbackSubject.next({
+        urlString: "bitwarden://sso-cookie-vendor?cookie=value",
+      });
+
+      const [result1, result2] = await Promise.all([promise1, promise2]);
+
+      // Both promises should resolve with same result
+      expect(result1).toEqual([{ name: "cookie", value: "value" }]);
+      expect(result2).toEqual([{ name: "cookie", value: "value" }]);
+    });
+
+    it("cancels previous acquisition when different hostname requested", async () => {
+      jest.useFakeTimers();
+
+      // The esline rule below is disabled, as the promise purposefully is not awaited/resolved, to test the behaviour.
+      // eslint-disable-next-line @typescript-eslint/no-floating-promises
+      service.acquireCookies("vault1.acme.com");
+
+      // Request acquisition for different hostname
+      const promise2 = service.acquireCookies("vault2.acme.com");
+
+      // Should launch browser twice (once for each hostname)
+      expect(platformUtilsService.launchUri).toHaveBeenCalledTimes(2);
+      expect(platformUtilsService.launchUri).toHaveBeenCalledWith(
+        "https://vault1.acme.com/proxy-cookie-redirect-connector.html",
+      );
+      expect(platformUtilsService.launchUri).toHaveBeenCalledWith(
+        "https://vault2.acme.com/proxy-cookie-redirect-connector.html",
+      );
+
+      // Simulate callback for second hostname
+      callbackSubject.next({
+        urlString: "bitwarden://sso-cookie-vendor?cookie=value2",
+      });
+
+      // First promise should still be pending (not resolved)
+      // Second promise should resolve
+      const result2 = await promise2;
+      expect(result2).toEqual([{ name: "cookie", value: "value2" }]);
+
+      expect(logService.warning).toHaveBeenCalledWith(
+        "Cancelling previous cookie acquisition for different hostname",
+      );
+
+      jest.useRealTimers();
+    });
+
+    it("handles invalid callback URL gracefully", async () => {
+      const promise = service.acquireCookies("vault.acme.com");
+
+      // Simulate callback with invalid URL
+      callbackSubject.next({
+        urlString: "not-a-valid-url",
+      });
+
+      const result = await promise;
+
+      expect(result).toBeUndefined();
+      expect(logService.error).toHaveBeenCalledWith(
+        "Failed to parse cookie callback URL",
+        expect.anything(),
+      );
+    });
+
+    it("ignores callback when no acquisition pending", () => {
+      // Simulate callback without any pending acquisition
+      callbackSubject.next({
+        urlString: "bitwarden://sso-cookie-vendor?cookie=value",
+      });
+
+      expect(logService.warning).toHaveBeenCalledWith(
+        "Received cookie callback but no acquisition pending",
+      );
+    });
+  });
+});
diff --git a/libs/common/src/platform/services/server-communication-config/server-communication-config-platform-api.service.ts b/libs/common/src/platform/services/server-communication-config/server-communication-config-platform-api.service.ts
new file mode 100644
index 00000000000..61ae21d064c
--- /dev/null
+++ b/libs/common/src/platform/services/server-communication-config/server-communication-config-platform-api.service.ts
@@ -0,0 +1,128 @@
+import { Subscription } from "rxjs";
+
+import { LogService } from "@bitwarden/common/platform/abstractions/log.service";
+import { PlatformUtilsService } from "@bitwarden/common/platform/abstractions/platform-utils.service";
+import { CommandDefinition, MessageListener } from "@bitwarden/common/platform/messaging";
+import { AcquiredCookie, ServerCommunicationConfigPlatformApi } from "@bitwarden/sdk-internal";
+
+export const SSO_COOKIE_VENDOR_CALLBACK_COMMAND = new CommandDefinition<{ urlString: string }>(
+  "ssoCookieVendorCallback",
+);
+
+/**
+ * API implementation for SSO cookie acquisition.
+ *
+ * Handles browser launch and deep link callback processing for SSO cookie vendor flows.
+ * Uses the MessageListener to listen for deep link callbacks from app.component.ts.
+ *
+ * @remarks
+ * - Opens browser via platformUtilsService.launchUri()
+ * - Listens for callbacks via MessageListener subscribing to SSO_COOKIE_VENDOR_CALLBACK_COMMAND
+ * - Deduplicates concurrent calls (single in-flight promise)
+ * - 5-minute timeout for safety
+ * - Returns undefined on timeout/cancellation (not error)
+ *
+ */
+export class ServerCommunicationConfigPlatformApiService implements ServerCommunicationConfigPlatformApi {
+  private pendingAcquisition: {
+    hostname: string;
+    resolve: (cookies: AcquiredCookie[] | undefined) => void;
+    timeoutId: NodeJS.Timeout;
+  } | null = null;
+
+  // Listen for callback messages from app.component.ts
+  private callbackSubscription: Subscription | null = this.messageListener
+    .messages$(SSO_COOKIE_VENDOR_CALLBACK_COMMAND)
+    .subscribe((msg) => {
+      this.handleCallback(msg.urlString);
+    });
+
+  private static readonly TIMEOUT_MS = 5 * 60 * 1000; // 5 minutes
+
+  constructor(
+    private platformUtilsService: PlatformUtilsService,
+    private messageListener: MessageListener,
+    private logService: LogService,
+  ) {}
+
+  async acquireCookies(hostname: string): Promise<AcquiredCookie[] | undefined> {
+    // Deduplicate concurrent calls - return existing promise
+    if (this.pendingAcquisition) {
+      if (this.pendingAcquisition.hostname === hostname) {
+        this.logService.info(
+          "Cookie acquisition already in progress for hostname, returning existing promise",
+        );
+        return new Promise((resolve) => {
+          const existing = this.pendingAcquisition!.resolve;
+          this.pendingAcquisition!.resolve = (cookies) => {
+            existing(cookies);
+            resolve(cookies);
+          };
+        });
+      } else {
+        // Different hostname - cancel previous and start new
+        this.logService.warning("Cancelling previous cookie acquisition for different hostname");
+        this.cleanup();
+      }
+    }
+
+    return new Promise((resolve) => {
+      // Set 5-minute timeout
+      const timeoutId = setTimeout(() => {
+        this.logService.warning(`Cookie acquisition timeout for ${hostname}`);
+        this.cleanup();
+        resolve(undefined);
+      }, ServerCommunicationConfigPlatformApiService.TIMEOUT_MS);
+
+      this.pendingAcquisition = { hostname, resolve, timeoutId };
+
+      // Open browser to cookie redirect page
+      // FIXME: Ensure that hostname either includes the schema and remove the httpsL//-prefiox or strip it beforehand
+      const url = `https://${hostname}/proxy-cookie-redirect-connector.html`;
+      this.logService.info(`Opening browser for cookie acquisition: ${url}`);
+      this.platformUtilsService.launchUri(url);
+    });
+  }
+
+  /**
+   * Handles deep link callback from browser.
+   * Called via MessageListener subscription when app.component.ts sends callback message.
+   *
+   * @param urlString - Full callback URL with query parameters
+   */
+  private handleCallback(urlString: string): void {
+    if (!this.pendingAcquisition) {
+      this.logService.warning("Received cookie callback but no acquisition pending");
+      return;
+    }
+
+    try {
+      const url = new URL(urlString);
+      const cookies: AcquiredCookie[] = [];
+
+      // Parse all query params except 'd' (integrity marker)
+      for (const [name, value] of url.searchParams.entries()) {
+        if (name !== "d") {
+          cookies.push({ name, value });
+        }
+      }
+
+      this.logService.info(`Acquired ${cookies.length} cookie(s)`);
+      clearTimeout(this.pendingAcquisition.timeoutId);
+      this.pendingAcquisition.resolve(cookies.length > 0 ? cookies : undefined);
+      this.cleanup();
+    } catch (error) {
+      this.logService.error("Failed to parse cookie callback URL", error);
+      clearTimeout(this.pendingAcquisition.timeoutId);
+      this.pendingAcquisition.resolve(undefined);
+      this.cleanup();
+    }
+  }
+
+  /**
+   * Cleans up pending acquisition state.
+   */
+  private cleanup(): void {
+    this.pendingAcquisition = null;
+  }
+}