I got about halfway there but in the end couldn’t import to TU, had an error that the model has “too many bones” lol - I tried using the TU blender model and my model would only load in grey/no textures and no easy way to rig to the TU skeleton. I just need a good video tutorial, if anyone knows of one?
I don’t know about Sims 4 specifically but make sure the original armature is gone completely and there is only the Tower Unite armature.