I'm not sure what is going wrong as we are not aware of any issues with connecting to Google Drive.
Can you please try to use Fiddler or enable logging to provide more info about what is going wrong?
Enable logging in TTMSFNCCloudStorageServices: TMSFNCCloudStorageServices1.Storage.Logging := True;
It creates the expected .INI file in the Documents folder but I can find no log file.
Could the issue possibly be related to which APIs are selected in Google Drive? I'd like to select the one(s) that allow access to just the folder used by my app, similar to the Dropbox way.