Similar hate post coming from me soon. I have an MSA & Office 365 (Azure AD) login using the same email. I use my MSA to login to my Surface, but now, all the sudden, I can't setup Outlook to connect to my O365 email. Their solution: rename your MSA. My response "no freaking way... no telling how much stuff that's going to break as I've used that MSA for over a decade".

And then I read your post today... I'm glad I closed my Surface and went back to my MacBook last night...

Ref: https://techcommunity.microsoft.com/t5/Outlook/Can-t-connect...