Hi @Canapin, thanks for your response.
I’ve managed to figure out the cause of the issue, this can be closed.
When a user already has an account, the save invite option no longer works. It used to prompt and say “There’s no need to invite X, they already have an account”… I think this is a much more elegant solution than just making the button no longer work.
Many thanks, all the best, Logan
Edit: just to confirm, I didn’t find any error in either of the locations you suggested.