Just double check the metal and roughness (cause unreal likes to do crazy things when you bring it in for whatever reason), i’m sure you HAVE. Just wanted to mention it, because I’ve had things get changed by unreal.
Next up, check on putting specular at zero
And check your Ambient occlusion.
I some times get shine from these.
There is also a tick, that says “fully rough” inside the material when you have the make material atribues selected. I can usually get it to vanish playing with those things.
Some times it still just wants to shine though so i’m gonna watch your question and hopefully i learn more!