Back a few years ago, when I had two names, FB locked my account because somebody reported my name as not being my real name, they wanted to see ID. I wrote them and informed them that I am transgender and that the name was not my legal name, but my preferred name and the name that I was known by. They responded and reopened my account. This was awhile ago, so I don't remember the exact specifics of the event, but it was something along these lines.