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Hi respected CEdward0764,
Thanks for your valuable feedback and sharing updates with us and I really appreciate your effort and your precious time doing.
And I appreciate your kind words.
Because your Office 2019 package got a latest update version 16.82 and it doesn't support on your Mac OS.
The issue is caused by **** AutoUpdate installing the wrong version of Office, what you can do is use the Help menu and choose Check for Updates. Under Automatic update, clear the check box to keep Office updated automatically. To let AutoUpdate do not install update Office into latest version.
Note: Turn off Automatic update, for your reference: Update Office for Mac automatically - Microsoft Support
You'd need to delete the wrong version Uninstall Office for Mac - Microsoft Support then again install the correct version, which is 16.78.3 which you can download from this link.
I appreciate your patience and understanding and thank you for your time and cooperation.
Sincerely
Waqas Muhammad