I have two email accounts on my GoDaddy domain. One for me and one for orders. Mine is randy@XXX and the other is order@XXX. They each have a different password.
However, Office 365 opens the randy@XXX account 90% of the time, independent of the account and password I'm using to open the email account. I have been making sure the randy@xxx account is closed when attempting to open order@XXX.
Now, I'm working from one office computer. There have been a few times the order@XXX account actually opened.
I'm running Windows 10, on a PC.
If I understand you want to open both accounts at the same time...
Try logging into your E-Mail control panel with your master account, your main account...
The master account should have consolidated emails...
Hope this helps
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.