Cannot add Google Calendar to Calendar Accounts
From Mac Calendar, when trying to add a new account, I get a message Google requires completing authentication in your web browser.After authentication, setup will continue in Internet Accounts.
After clickling Open Browser, a cog wheel appears to be turning again and again and never reaches Google to authenticate. Therefore I cannot use the Mail app. It's been happening for months now and I have tried suggestions I have found online.
Can you please help me solve this?
MacBook Air (2020 or later)