How licensing works for work and school accounts in the new Outlook for Windows

My experience with Outlook is neither an "innovation" nor an "improvement" as this article portrays it.

I bought Microsoft 365 from Microsoft.

I also have a domain set up at Go Daddy. My account with Go Daddy apparently required the creation of another Microsoft account.

Whenever I try to log on to my Microsoft account I am confronted with two Microsoft accounts and required to select my personal account or my "School or Business" acount to log on to.

This bewildered me. I didn't know I had two Microsoft accounts. (I don't need two Microsoft accounts. I don't want two Microsoft accounts.)

Nor did I characterize my account with Go Daddy as a "school or business".

This duplication of accounts is an ongoing dilemma and frustration and obstacle.

Recently, I added my email address to Outlook. It failed. The error message stated "something went wrong: Error 1200...contact your IT department or service provider."

I am an individual, sitting at my home desk. I have no IT department and resent the assumption that everyone who struggles with Microsoft and its endless barrage of technojargon works for a large corporation with IT staff they can call to make sense of what should be simple procedures.

After hours working with Go Daddy tech support they finally gave up and gave me a phone number to call to talk to someone at Microsoft. And they gave me a link to this article.

OF COURSE there is NO HELP available from Microsoft by a human over the phone.

So, surprise me! Tell me how to get my email address to successfully added to Outlook on my computer.

I might add, the email address in question works just fine with Outlook on my other PC and Android phone.

Finally, I would love to unravel the complications of having useless, unnecessary, multiple Microsoft accounts and distill down to one Microsoft Account. 

How do I do that?

Thank you for your guidance.