fix: issue 3772

src/google/adk/auth/credential_manager.py

@@ -182,10 +182,6 @@ async def _load_existing_credential(
     if credential:
       return credential
 
-    # Check if we have a cached exchanged credential
-    if self._auth_config.exchanged_auth_credential:
-      return self._auth_config.exchanged_auth_credential
-
     return None
 
   async def _load_from_credential_service(

tests/unittests/auth/test_credential_manager.py

@@ -131,22 +131,6 @@ async def test_load_auth_credentials_no_credential(self):
 
     assert result is None
 
-  @pytest.mark.asyncio
-  async def test_load_existing_credential_already_exchanged(self):
-    """Test _load_existing_credential when credential is already exchanged."""
-    auth_config = Mock(spec=AuthConfig)
-    mock_credential = Mock(spec=AuthCredential)
-    auth_config.exchanged_auth_credential = mock_credential
-
-    callback_context = Mock()
-
-    manager = CredentialManager(auth_config)
-    manager._load_from_credential_service = AsyncMock(return_value=None)
-
-    result = await manager._load_existing_credential(callback_context)
-
-    assert result == mock_credential
-
   @pytest.mark.asyncio
   async def test_load_existing_credential_with_credential_service(self):
     """Test _load_existing_credential with credential service."""