High poly scene could not be loaded when trying to bake curvature and thickness

Hi

I get the following message when baking from high to low in Substance Painter.

[BakingProcess] Highpoly scene was required when baking Curvature Map from Mesh but could not be loaded.
[BakingProcess] Highpoly scene was required when baking Thickness Map from Mesh but could not be loaded.

I have 'by mesh name' enabled, the names of the models are correct. I am uploading FBX Binary files. I disabled 'Enable CPU raytracing'. I cannot find any advice online anywhere.

Any advice would be appreciated.