Got it to work!
So I enabled 2FA AND removed all trusted computers from Microsoft Account.
After that all UWP apps started to work (after reauthenticate) and all the desktop app had to first disconnect from Onedrive and reconnect. That's it.
Now everything works! (So many new items created in every device and checked that every item gets to every device and app)
Thank you for your help, @Anshu kumar!