Hey, I had the same issue and found a solution that worked for me. No more incorrect email address linked to my local admin account. I posted the solution a few minutes ago under another thread:...

HEY ! I think I found a solution. At least for my case.
I was going to reboot my computer because I removed that bad email address from Microsoft Mail which I had been using in the past before...

Have similar issue. Had a local admin account. Always had. No email address linked to it. But recently Microsoft, in a very respectful move, decided to link one of my old email addresses to that...