as a clan member you should have to apply there and than someone have to affirm that. because of the new BF1 "Battlelog" its all a bit stupid. lol
even if you will play with your tags, than you need to be in the platoon and than you must hit the button "represent this platoon"
even if you will play with your tags, than you need to be in the platoon and than you must hit the button "represent this platoon"