devtrackers.gg
Source: https://www.bungie.net/7/en/News/Article/destiny-2-hotfix-6-02-23
GENERAL
- Due to an issue, the Khepri's Horn exotic Titan helmet has been disabled in all activities.
- Iron Banner's gametype has changed from Control to Eruption.
Source: https://www.bungie.net/7/en/News/Article/destiny-2-hotfix-6-02-23
I can't even launch ib now it says placeholder. Every other pvp mode is launch able though.
You may be in an odd state between the disabling and enabling of the modes. Try going to the Tower and back to Orbit and you should be good. If not, try restarting the game.