A little unclear as to why you marked my previous response which only asked questions to clarify you environment as not resolving your issue
Re: Your Verizon account
#1 - The information relevant to that account would be what the current server settings for the account are set to. Done by going to
<File> --> <Account Settings> --> <Server Settings> as shown in the attached screenshot
#2 - The information asked about the version / build / channel info was shown in the attached screenshot - it was not the informtion when clicking on the <About Outlook> button which does not show what channel you are on
The reason the was asked was to see if it falls under what is described in
How to add a Yahoo IMAP account to Outlook Desktop without an App Password
https://support.microsoft.com/en-us/office/how-...
A number of people have reported having issues similar to what you've described since the above came into being
#3 - Re: "I am not aware that Verizon/AOL has made any changes to my account."
Did you ask them?
#4 - Re: "I have no idea as to how Yahoo knows my Verizon email address"
Without knowing anything else about what is going on, Verizon did at one point, use Yahoo servers.
In any case, this is an open forum so hopefully someone else will hat the exact information you are looking for
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