A player, I (Team-Manager) invited did not receive the Email - what should I do?

The email sent to players that have been nominated / invited to a validated team roster is not necessary to proceed with the registration flow.

The player can always log in to https://teams.fiba3x3.com using his play-account credentials and accept or decline the nomination.

So the best way to proceed is asking the player to login to https://teams.fiba3x3.com and accept the nomination.

Do note that emails may do not reach a reciepient for a variety of reasons like spam filtering or a full inbox of the receiver.