How to use gltf animation extension in Visual Studio Code?

Hoping someone can explain or point me in the right direction for help in getting glTF animations to play in Mixed Reality viewer and in PowerPoint.
I’m using Visual Studio Code with the glTF Tools Extension (21.16) to try and add an Animation trigger to my glb file (which was exported from Blender).

However, I keep getting a glTF Validation error: Unsupported extension encountered: ‘EXT_animation_map’.
I’m following the instructions from this Microsoft Mixed Reality guide:

I also tried it using code from the FB_animation_map extension below but also got Extension not found error:

Is there something else I need installed or configured in Visual Studio Code to make this work?

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