I was playing as my nomad character Hienreich Fritz and tried to buy a wild ID but it wouldn't let me. I tried unequipping my nomad ID and it still said "access denied", so I ended up selling my ID and trying to buy the wild one but it still didn't work and now I can't even buy back my nomad ID, please help.
You can't buy Wild ID. Unfortunately, this ID is only available to Wild official factions, and indies have to be content with Wild Pawn (Lord, forgive us) ID. Honestly, I don't remember if you can buy it anywhere, but definitely you can get it by using one of two restart commands in game: "/restart rhwild" or "/restart kuwild" (without quotes, of course). To become Rheinland or Kusari origin henchman of the wild, respectively, and get your Wild Pawn ID.
P.S.: And btw, yah... Jfc, mate. Don't you think that Hienreich Fritz isn't the most appropriate name for an alien silicone-based life form using organic ships, eh? This is a role-play game, damnit. Sorry for salt, but it just makes me feel bad. Do smth with this shame, I beg you.