Facebook just outright refuse to give the username.
If the username you're claiming has been used since (long) time, than, there is no right for you. First come, first serve..
You have to talk to the account directly. After that, you'll need to find a way to transfer it from them to you.
If the username you're claiming has been used since (long) time, than, there is no right for you. First come, first serve..
You have to talk to the account directly. After that, you'll need to find a way to transfer it from them to you.