I had Microsoft do this. They notified me that my account was being suspicious, so I needed to provide a phone number to use it. I had literally just made the account though, zero activity at all. It was just to force me to give a phone number to them for their data harvest
I ran into this with MS as well. However, they explicitly stated that it did not need to be my phone number. So since it was for a work thing, I ask to use my boss' number to get around the lockout. Seemed pretty pointless.
