Comment by kgizdov

Microsoft VP Identity Division, Alex Simons, apologised on twitter and said they will release a fix overnight. I was actually able to log into my account today. But before you get too excited, what they've done is they've completely disabled the sign-in preferences menu and still have the bug - I cannot enable password-less login as it tries to send a notification to my phone, but that is no longer listed on my account. But the system clearly knows about it and wants to send a notification. Unfortunately, it cannot because it also requires it to be a sign-in option. It's a crazy loop of madness.