Private Links still don't work on Kicked Tribe Members ! (Even on the latest update)

I kicked a member in my tribe and he wants to join back , I agreed and gave him a private invitation link . however , the private link seems to not be working ..... He tried clicking it , copy&pasting it but still won't work

But it shows a notification at the menu when he copy&pastes it that says "Welcome to Black Solitude" . he checked if his in the tribe , but still not .. please help ~

thanks in advance .