Sadly (and for my doctoral research and human rights activism) disturbingly, TAGS doesn’t seem to be authorised anymore by Google. When trying to authorise TAGS, Google now says “Sign in with Google temporarily disabled for this app. This app has not yet been verified by Google in order to use Google Sign in.” There’s no way around it. Screenshot at https://ict4peace.files.wordpress.com/2020/04/annotation-2020-04-20-102034.jpg
Thanks for confirming and the screenshots. I’ve tried to replicate on a couple of @gmail.com accounts but didn’t encounter the screen that stopped you. Do you have another @gmail.com account you can test with?