Google Calendar Integration fails to load

After upgrading to 2023.1.2 i see the google calendar integration is not loaded, so i re-created the application credentials from scratch, but i always have this screen when the integration finish to load:

Schermata 2023-01-09 alle 15.00.06

It means the integration is loaded succesfully, but i get also this:

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I have nothing in the logs. The application credentials are regularly saved.
How to have the integration working again?
I repeat, this is happening after upgrading to 2023.1.2 and before this everything was working properly.

EDIT: I have a doubt. Do we still need the API Key for this integration? If yes how to get it?