Can't invite people to tribe on iOS?


Hi there,
I use to play this game ages ago and decided it was time to take up the sword again :)
I got some of my friends to join with me and all good so far...
However I have noticed that I can't send out invitations to join a tribe on iOS...
I can however invite people on PC.
Is this a bug? Or has it not been implemented?

PC i click on village, click village info, click player info and then click invite to tribe
on iOS when i get to the player's info only the option of sending a message appears...