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Sync Not Working: After Logging Into Sync, Error Message "Session Expired" Appears

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Just used sync in the past month with no issues.

Logged into sync today, immediately after logging in, the error message "Session Expired -- Sorry something went wrong. Please sign out from the browser window and try again." See attachment to see exact error message.

This exact error message appeared on both my PC's when I tried to sync between them. Any thoughts on what is taking place or is there a know issue with Sync from Mozilla today?

Just used sync in the past month with no issues. Logged into sync today, immediately after logging in, the error message "Session Expired -- Sorry something went wrong. Please sign out from the browser window and try again." See attachment to see exact error message. This exact error message appeared on both my PC's when I tried to sync between them. Any thoughts on what is taking place or is there a know issue with Sync from Mozilla today?
Attached screenshots