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Muted blendshapes detected!

Muted blendshapes detected! Muted blendshapes will receive animation data but will not display the animation.
This message indicates that some of the blendshapes, that will be used by the platform, are muted (disabled). This means that they exist and are recognized by the system but their muted status will result in them not being animated even though they will receive the animation data.
Blender
If a supported blendshape exists on the object, it will receive animation data, but if that blendshape is muted it will not deform the mesh. Such blendshapes will be listed in the add-on. This is supposed to increase transparency and bring attention to where the loss of data will happen.