Go to the Help menu and choose Check for Updatesĥ. Make sure your Mac has a working internet connectionĤ. Make sure your Mac has a working internet connection before checking for updates.ģ. I suggest you please updates your Office 365 into latest version on your mac OS. Since you mention issue happen after upgraded Mac to Big Sur. I just tested the 16.43 (20110804) version,Īnd it seems to work fine from my side on Mac OS Big Sur. I apologize for all the trouble it has caused and sorry about your time.