Mr GIB, before I can accept your Join Request into the "Captains - KoG" Usergroup, you must update your "XG Rank" and your "GamerTag" on your profile.
To update your "XG Rank", click "About Me" on your profile (directly above), click the yellow pencil next to "XG Rank", update it to "Captain", then "Save".
To update your "GamerTag", click "About Me" on your profile (directly above), click the yellow pencil next to "GamerTag", type in your new GamerTag, then "Save".
Thank you!