I feel like your answer would be correct in almost every sense except in this case I cannot get it to work. I went so far as to delete all browsing data at close, from cookies to saved passwords, deleted all the web credentials. I'm at a loss. I appreciate your help though!
Thanks for your quick reply. I have removed the unwanted credential, restarted the machine, and still have the prompt to login with both accounts. Any other ideas good sir?

Hi Vignesh,
Thanks for this suggestion, however, I need multiple MS accounts on my machine.
These login options are cached somewhere because until you log in the first time with one they do not appear.