If you remove all traits then re add them starting with alien trait first it might work, it worked for me in Nov.
I removed the alien trait because did not play nice with the vampire & spell caster traits, I kept turning purple.
@Damek35719 I've moved your post to the console section.
P.S. Thank didn't know there was a different place to post for console I'm just getting back into sims after a long while
Oh an hear traits.equip_trait trait_OccultAlien is the cheat I used or tried and if not close with something misplaced my English spelling not that good
@Damek35719 Here's a thread on aliens, non aliens, and partial aliens. If your sim is partial alien or other occult they have another trait that must be removed first. https://forums.thesims.com/en_us/discussion/comment/13890532/#Comment_13890532
Here's a guide to all cheats https://www.carls-sims-4-guide.com/cheats.php
Any other occult traits must be removed before you can add a new occult to the sim.
Ok so is there anything else that can mess with the add alien cheat to cover my basses. Also you've been very helpful I think I'm close to the answer it might be a trait my sim has
