How to skin a dynamic head?

I’m new to 3d modeling and want to make a dynamic head with a mesh that I have. I followed a tutorial of taking the SemiRealisticMale.zip file, importing my custom head, joining it to the default head then deleting the default head, selecting my custom head and the armature then clicking “with automatic weights” and keep transform, deleting the face organs, deleting the bones for those parts, then exporting as fbx.
But when I try to upload as a Head asset to ugc I get the error Missing Skinning Data for Head.MeshId. Any help with this is appreciated

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Could you elaborate please? Because I’m having the same issue as him, and this didn’t help me.