Your Bungie account is newer than the time that emblem was available, so you likely setup and moved Bungie profiles accidentally while setting up cross-save. That'll mean your emblem wont be equippable again unless you can get back onto the old Bungie profile and move your accounts back to it, but that means losing your current Bungie friend list, any emblems earned via Bungie rewards on this one, any redeem code emblems, and possibly having your name reverted [quote]EMBLEM OWNERSHIP UPDATE Starting with the launch of Season of the Deep, emblem ownership values were updated. For security purposes, players who have emblems on their account that do not appear in their Collections (Collections-Flair-Emblems-General) will no longer be able to equip these emblems, and players will no longer be able to see these emblems if they are still equipped. Those who are affected by this change will need to reacquire these emblems through proper means by unlocking them in their Bungie.net profiles or on their platform if they wish to continue using them. Players who have emblems unlocked on their Bungie.net accounts and platforms are unaffected by this change.[/quote] https://www.bungie.net/7/en/News/article/twab-may-25-2023