�3https://support.google.com/accounts/answer/12379384 ��*.

   authFailed resource://gdata-provider/legacy/modules/gdataSession.jsm:311
   <anonymous> self-hosted:1115
   onPromptAuthAvailable resource://gdata-provider/legacy/modules/gdataSession.jsm:330
   onAuthorizationFailed resource://gdata-provider/legacy/modules/OAuth2.jsm:226
   _checkForRedirect resource://gdata-provider/legacy/modules/OAuth2.jsm:145
   onLocationChange resource://gdata-provider/legacy/modules/OAuth2.jsm:187

I am trying to set up the calendar in Thunderbird for my mother. She uses a google calendar and it is working fine on the old computer. However, on the new one, it lets me get as far as trying to select a calendar to subscribe to be the list is blank. In trying to troubleshoot, I tried setting up my own calendar on a different computer and the same is happening. Mother's is a Windows 11 and mine is a Windows 10. In troubleshooting I came across a post that suggested that I open the dev console and by golly there is an error there. The same error appears on both accounts/computers. ''[Exception... " �invalid_request��� You can't sign in to this app because it doesn't comply with Google's OAuth 2.0 policy for keeping apps secure. You can let the app developer know that this app doesn't comply with one or more Google validation rules. �3https://support.google.com/accounts/answer/12379384 ��*. �redirect_uri��urn:ietf:wg:oauth:2.0:oob:auto2�������The out-of-band (OOB) flow has been blocked in order to keep users secure. Follow the Out-of-Band (OOB) flow Migration Guide linked in the developer docs below to migrate your app to an alternative method.�Ohttps://developers.google.com/identity/protocols/oauth2/resources/oob-migration" nsresult: "0x80004005 (NS_ERROR_FAILURE)" location: "JS frame :: resource://gdata-provider/legacy/modules/gdataSession.jsm :: login/authFailed< :: line 311" data: no] 2 gdataSession.jsm:311:25 authFailed resource://gdata-provider/legacy/modules/gdataSession.jsm:311 <anonymous> self-hosted:1115 onPromptAuthAvailable resource://gdata-provider/legacy/modules/gdataSession.jsm:330 onAuthorizationFailed resource://gdata-provider/legacy/modules/OAuth2.jsm:226 _checkForRedirect resource://gdata-provider/legacy/modules/OAuth2.jsm:145 onLocationChange resource://gdata-provider/legacy/modules/OAuth2.jsm:187 '''Where is/how do you set the calendar to use OAuth 2.0?''' Email works fine is already set to OAuth 2. The calendar on the old computer works fine. Before the "choose account" window opens, it does seem that google trys to open a pop-up to enter the password, but the window closes and the "choose calendar" window that is blank open.'' ''' Is this a bug? Can it be fixed?'''