Same issue for me aswell. could it be export from unreal?
I tried different things and got the error ‘inconsistant topology error’ I haven’t changed number of verts.
In the end I checked the same without even editing, still same error.
exported a working body skeletal mesh. from unreal (this is working as template)
reimported it into unreal without even opening in any DCC. still i got the same error.
But I seen a tutorial where it worked for him. He only showed importing and using as template though.