diff --git a/libs/common/src/auth/services/token.service.spec.ts b/libs/common/src/auth/services/token.service.spec.ts
index f24e137045..1bbd49ea7c 100644
--- a/libs/common/src/auth/services/token.service.spec.ts
+++ b/libs/common/src/auth/services/token.service.spec.ts
@@ -1214,7 +1214,7 @@ describe("TokenService", () => {
         // Act
         const result = await (tokenService as any).getRefreshToken();
         // Assert
-        expect(result).toBeUndefined();
+        expect(result).toBeNull();
       });
 
       it("should return null if no refresh token is found in memory, disk, or secure storage", async () => {
diff --git a/libs/common/src/auth/services/token.service.ts b/libs/common/src/auth/services/token.service.ts
index f6d05a4c0f..0ea8fd6bb3 100644
--- a/libs/common/src/auth/services/token.service.ts
+++ b/libs/common/src/auth/services/token.service.ts
@@ -550,11 +550,11 @@ export class TokenService implements TokenServiceAbstraction {
     }
   }
 
-  async getRefreshToken(userId?: UserId): Promise<string | undefined> {
+  async getRefreshToken(userId?: UserId): Promise<string | null> {
     userId ??= await firstValueFrom(this.activeUserIdGlobalState.state$);
 
     if (!userId) {
-      return undefined;
+      return null;
     }
 
     // pre-secure storage migration: