Are you even apart of the clan? Even if your not you should be told to take it off, not just instant kick, new admins doing i would assume
yes he apart of the clan pun. I believe he is referring to auto-kick. And make sure there are no special characters in your name. If it is still doing it, then try using a completely diff name, see if that helps.
Join the game w/o the tag first and once someone sets you as a clan member ingame you should be fine. its just a prevention to stop people from using the tag