Problem
"When I try logging in to Office 365 (OneDrive, Outlook, Office applications, etc.) I get a login error asking me 'which account do you want to use' and if I want to 'rename your personal Microsoft account.' How do I fix this?"
Solution
To resolve the issue, you will need to log in to your personal Microsoft account and rename it.
We’ll let the experts explain this one.
Visit Microsoft's Which account do you want to use? page for more information.