Multi-Login Issue

Google doesn't support multi-login (logging into multiple accounts at the same time) for extensions. If you run API Connector while logged into multiple Google accounts simultaneously, accounts other than the primary account will likely see a persistent loading screen like this:

To resolve, log out of all your Google accounts and then log back in first with the account you're using with Sheets + API Connector. Alternatively, log in through a new profile or incognito window.

For more information, see here: https://developers.google.com/apps-script/guides/projects#fix-issues

You can also star this issue in Google's bug tracker, if you'd like to receive notifications of any updates: https://issuetracker.google.com/issues/69270374