Hello everyone,
i'm not a odoo expert
i have odoo v12, i configurated a google api calendar in order to sync with my odoo calendar, i followed all the steps, after input auth and id in odoo calendar, i click the sync button under calendar page for first time the system redirect me to google account and ask me to permitt the sync, after i agree i received a webpage error said: somethings goes wrong. then i  try to clic sync but receive this error:

Something went wrong during the generation of your token. Your Authorization Code is probably invalid or expired [unauthorized customer]

I try to enter again the key but with no luck. I try to create a new google user and create a new OAuth ID, but when  iput the new user under odoo i receive directly the same error. I would ask you if you can help to understand, where i find logs, and where is possible to delete all in order to add a new user and id in order to rigenerate a new connection.
Thanks for any suggestion