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Information on how to add the Google 'Tasks' into Thunderbird Calendar: I have a gmail imap account using OAuth2 as Authentication Method.

File > New > Calendar, select 'Google Calendar' >  click on 'Next' choose or enter: gmail email address   > click on 'Find Calendars' Select 'My Tasks' and click on 'Subscribe'

You may be asked to enter password as per Oauth2 Authentication.

See image. It shows the selection available when you follow instructions. It shows where 'My Tasks' is located in the Calendar list. I selected 'My Tasks' and then clicked on 'Task'. Create the Task and save. Task is shown in Thunderbird and on the right side you can see the Task is displayed via the webmail access using a browser.

Firefox 99.0

I guess it's a problem with the latest update because it didn't happen to me before. Gmail keeps showing me this message: "Gmail is having authentication problems. Some features may not be operational. Please try logging in to troubleshoot the problem." I have relogin, deleted the cookies and site data but I still get that message. I have tried starting the browser from "about:support" in troubleshooting mode but the error still appears. This does not happen in other browsers.