ERROR_NOT_AUTHORIZED when creating real time multiplayer room SDKOX GPG plugin

I have setup real-time multiplayer for my Android game on Play Console. The game is currently in open beta and now I wanted to add the multiplayer feature. I have created 2 linked applications for my debug and release certificates.

Code:

gpg::RealTimeRoomConfig config = gpg::RealTimeRoomConfig::Builder().SetMinimumAutomatchingPlayers(1).SetMaximumAutomatchingPlayers(4).Create();
            _game_services->RealTimeMultiplayer().
            CreateRealTimeRoom(config,
                               this,
                               [this](gpg::RealTimeMultiplayerManager::RealTimeRoomResponse const & response) {

                                   string msg;

                                   if (gpg::MultiplayerStatus::VALID == response.status) {
                                       msg = "Room created: ";
                                       msg += response.room.Id();
                                       _txtStat->setString(msg);
                                       //cocos2d::log("create room success");
                                       CCLOG("create room success");
                                       setRoom(response.room);
                                       cocos2d::log("create room");
                                   } else {
                                       msg = "Room failed: ";
                                       msg += to_str(response.status);
                                       _txtStat->setString(msg);
                                       CCLOG("create room failed");
                                       cocos2d::log("create room fail");
                                   }
                               });

When I deploy the build on an Android device, the code is able to sign in using the test accounts but the room creation code generates “ERROR_NOT_AUTHORIZED” error.

When I test my game settings with the Google’s Android sample project, it works without any issues. Are there any known issues with the SDKBOX GPGS plugin?
I would appreciate any suggestions and thoughts on this topic. Thank you.

ERROR_NOT_AUTHORIZED: did you login success?

Yes. Login is successful.