What can I do if an invite has been sent but the player/squad is not responding?
Unfortunately, not a lot!
Emailing invites is the best way to get an individuals attention however it is up to them to register. If a user does not want to register, the squad will remain a placeholder squad.
This is also the same for players.
If you are a member of a league, there are cards you can print out and give to the other squad. The cards displays all the current information needed for the player to register and activate the squad.