Thanks for the effort but I found a work-around. 

I didn't want to open both accounts at once.  However, after booting, what even account I opened would be the ONLY one I could open even if using the other account name and password.  This was the case using FireFox.  So now, I use FireFox to open one of the accounts and later if needed, I can open the other account using MS Edge. 

I think, FireFox is replacing my log in with the account information first used after boot.