I am considering that since we both had the same seemingly "someone trying to login from various countries" problem, that this problem is not really a person, but some strange doings inside Microsoft that has something to do with the login problems that cause all these OneDrive errors.
So let's have an AMA, Microsoft. What's really going on here? Are you intending to drop support for OneDrive, or are you hoping that people pronounce it as so bad they get out of it?
If your intention is not to kill it intentionally, let's get on the ball and FIX IT. if this is a critical system for you, then please ACT like it.
You do realize that people have THEIR LIVES tied up in your cloud? Can you have just an ounce of compassion? Perhaps post something on X to explain what's going on, and when it will be fixed.