Invite Code invalid

IGN: ClassyClown5
I’ve tried to invite my friend to the game multiple times, every time he puts my invite code in it says that the code is invalid. He’s on a fresh account lvl 1 so that isn’t the issue.

Hey Classy! Sorry to hear that you’ve had some trouble.
If this continues to happen are you able to share any screenshot of this?

Do you recall having shared it with others previously?