It appears that VisionOS has changed this so that it -does- support Blend Shapes as of OS 2.0 (https://developer.apple.com/documentation/realitykit/validating-usd-files#Review-skeletons).
Does anyone have -any- idea how on earth to get them to work? RealityConverter doesn't seem to see them.
theonlyone
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** POSSIBLE SOLUTION **
I had this same problem on every Desktop Browser, but then was able to log in and accept the agreement using my mobile (iOS Safari) browser just fine.