Strange Occurrence in Microsoft Accounts

Hello everyone,

I have discovered something very strange in setting up two Microsoft accounts. It is as follows:

I have two Microsoft Outlook accounts or Microsoft accounts - *** Email address is removed for privacy *** and *** Email address is removed for privacy ***. I setup my Windows 8.1 pc with *** Email address is removed for privacy *** and the mail app was able to sync with the webmail and all was fine. I decided to setup *** Email address is removed for privacy *** as my other email account and thus tried to set it up through the mail app but it refused to do so 100 out of 100 times. It said "We are unable to find settings for *** Email address is removed for privacy ***. Please provide additional info and we'll try connecting again." It never worked anyway.

So I tried setting up another user account on my pc with *** Email address is removed for privacy *** and it worked perfectly well in that new user account. Now, here I tried to setup *** Email address is removed for privacy *** as my other email account in the mail app and it gave the same error in this account. "We are unable to find settings for *** Email address is removed for privacy ***. Please provide additional info and we'll try connecting again."

How is it that each of these user accounts could be setup as separate user accounts but not as just another email address? This absolutely baffles my mind. Does this mean that we can setup only one Microsoft account/email account on one Windows 8.1 pc? That obviously doesn't make any sense. If someone can give me an answer, I would be very grateful to that person.

Thank you very much.