I tried to add my Google Calendar on a fresh install and when clicking the link I get a message saying that
Error 400: invalid_request
The out-of-band (OOB) flow has been blocked in order to keep users secure.
Follow the Out-of-Band (OOB) flow migration guide linked in the developer
docs below to migrate your app to an alternative method.
Further details: redirect_uri=urn:ietf:wg:oauth:2.0:oob
I tried to add my Google Calendar on a fresh install and when clicking the link I get a message saying that
The message also links to this guide: https://developers.google.com/identity/protocols/oauth2/resources/oob-migration as further explanation of how to fix this error.