Export missing details that can be seen in RC

Hi friends,

I export the scan result to either obj or fbx with and without normals but the details are missing in the mesh. Checking the high poly in Maya confirms the mesh holds no details so I can't generate normal maps.

What am I missing? I thought the details would be built into the RC mesh result of the capture but the incoming mesh has no such details. But I can see these details on the mesh in RC...?!

Any tips what I'm missing much appreciated please!

Thanks a bunch!

RC 4K render:

RC export settings - i tried both obj and fbx, and true for vertex normals:

RC capture as shown in Maya - no detail:

Substance normal rendered on low poly. Same result with Xnormal, Substance or Maya generated normal map: