Facebook Page Username

Hi all,

I just wanted to create a username for my facebook page. So I typed in my username and it was available. Confirmed it and had the error that this username is not available. I tried a different one, same problem. Even when I enter a complete random name, still getting the error: not available.
I tried this with multiple accounts (admins for fb page), different devices and IP's. Facebook itself never replied.

Any recommendations?

i think ip issue. reason i face the same issue with instagram. try to use some proxy or any another network