If you have signed in with multiple gmail accounts in your web browser and try to use any G Suite add-on, you might see this error: drive.google.com refused to connect. Please open an incognito window, sign in with your gmail account used to install the add-on (make sure that you haven't signed in with any other gmail account) and try to use the add-on. It should work.

"drive.google.com refused to connect" error when trying to use the add-on while I've signed in with multiple gmail accounts in my web browser settings

Add-on works when I've signed in with only the gmail account used to install the add-on settings

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