Cannot invite person to team create

Issue: I am inviting people to my team create and with one of them i couldn’t invite them and it was just loading forever, although it worked for the previous person i invited. Could this be a filter?

You can invite only your friend
Friend person u want and after this u can invite he

im friends with them though, also people that arent friends show up too

Do not put moderated characters in the field.

what am i supposed to do, its their username