I'm stucked with this issue and can't make any change in the configuration as I can't save anymore.

Google calendar settings are fine and I have access to my google calendar.

Clicking on synchronize in calendar view give an error message : error while creating the token. Your arctivation code might be invalid or expired (unauthorized_client).

On goole APIs console, I have renewed the ID & secret code but does'nt help.

Does anyone has nay idea how to get out of this ?

Many thanks...