Hello all,
I modeled a character on Blender that I rigged and animated in order to export it to roblox but when I import it, the IK bones have disappeared and the animations do not take into account them, I don’t know what do, here are the pictures:
Blender:
Roblox: 
Hoping someone can help me, thank you
I solved my problem! Two errors were at the origin of this defect, the first is that I had named a bone and a part of the detached body of the same name, the bone therefore disappeared. The second is that I had parented deformity bones to IK bones.
thanks for anyone else struggling with bones not appearing if your bones are named the same like you copy pasted a boned rig and are using multiple of the same boned rig you have to and and individually rename the bones of them to seperate thing so like I just use x, xx, xxx to signify wich one they are for each bone and it does the rest like if it’s the fith bone you named xx it automatically goes to xx.05~!
