Marker Based with animation-mixer not playing single clips

[crgptrgll]

I'm using Ar.js marker and location based with a-frame animation-mixer component on a GLTF model and it's not letting me play single specific clips on mobile (with e.g. clip:Walk).

Its working as expected with the desktop webcam, but mobile will oniy recognise the wildcard (clip:*) which plays all the animations.

So perhaps it's some nonsense or variation to do with strings for individual clips I'm missing here ??

Can anyone help me out? Thanks in advance.