How to sign-in my personal microsoft account that seems to not exist all of the sudden.

[Microsoft Windows]

I have used my personal Microsoft account on both my computer and my Minecraft account for a long time now. I played Minecraft with that account for the last 2 weeks. And then today when I decided to play Minecraft, my account went "That Microsoft account doesn't exist.". And when I logged in, it said "You can't sign in here with a personal account". I tried the "sign-in helper", and it found no problem with my email that I currently can't access. So it means it is still there. The helper was of no use. I need to know how to access my account.

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