Forza clan tags

It is actually called a Golden clan tag on elite and you have to join a level 10 clan or level a clan up to level 10. Then the clan leader can pick the clan tag for your entire clan. You cannot customize the clan tag your self so the Golden clan tag stays
at whatever the leader sets it as.

Are you talking about your 'clans' clan tag or your characters clan tag?

Gold clan tag is for level 12 clans, level 25 clans get red clan tags. However, if the bracket on the outside of the tag is colored then it's modded. Every other color is for sure 100% modded or glitched.

It is Xbox (or microsoft) who is finding the fault, as activision employs Microsoft's language filter.My clan tag is being blocked, but it is because my Gamertag has a prohibited character in it (im assuming) because my name has a "space" in it. this is
systemic in that after the most recent update the language filters employed by microsoft consider my gamertag prohibited. for any game where i can add a "clan tag" in front of my name it is blocked. So far, as I have encountered, only Modern Warfare and Forza
Motorsports 4 allow for a "clan Tag" and i have only experimented with the Call of Duty games.

I'm not sure about the end of the gamertag clan tag. The colored clan tag was a glitch.