Microsoft 365 login

Hi folks,

I can't login into my Microsoft Account from any Office 365 application on my Laptop.
I can login to my my Account in any Webbrowseron my Smartphone and so an.

Unfortunatly there is no working Microsoft Support System for this problem. Instead there is an infinite support loopwhich gets me in between a repair toolthat cant find any problems with my account and wants me to change my password.

Anyone any idea how to fix this?

thx