Google-4-TbSync
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Authorisation Error
(https://addons.thunderbird.net/en-GB/thunderbird/addon/google-4-tbsync/reviews/1173341/)
This is what is happening since yesterday, 9 Jan 2024: Authorisation Error Error 400: invalid_request
You can't sign in to this app because it doesn't comply with Google's OAuth 2.0 policy for keeping apps secure.
You can let the app developer know that this app doesn't comply with one or more Google validation rules.