Playing mocap animations in THREE.js gives "No Target Node Found" error

Question

I have motion capture .fbx files from a Qualisys system, exported from Theia. I'm not part of the capture process so I'm not 100% on the details there. Unfortunately, the format of the bones in the .fbx file don't seem to line up with anything I need them for. I want to use them in Unity and Unreal Engine, which require retargeting. I also want to display them using THREE.js, and that brings me here.

I've converted the .fbx file to a .glb file and have the mesh displayed in THREE.js, but it wont animate. To play the animation I'm using:

loader.load(path, async function ( mdl ) {
        if(mdl.animations.length > 0)
        {
            console.log(`Loading animations for ${data.name}: ${mdl.animations.length}`);
            scene.mixer = new THREE.AnimationMixer( mdl );
            scene.action = scene.mixer.clipAction(mdl.animations[0]);
            scene.action.play();
        }
}

The model is showing, and I see my console.log showing 2 animations. But then the console shows these errors (shown for every bone, I've just shown a few) :

THREE.PropertyBinding: No target node found for track: person_0pelvis.position. three.module.js:48585:12
THREE.PropertyBinding: No target node found for track: person_0pelvis.quaternion. three.module.js:48585:12
THREE.PropertyBinding: No target node found for track: person_0pelvis.scale. three.module.js:48585:12
THREE.PropertyBinding: No target node found for track: person_0abdomen.position. three.module.js:48585:12
THREE.PropertyBinding: No target node found for track: person_0abdomen.quaternion. three.module.js:48585:12
THREE.PropertyBinding: No target node found for track: person_0abdomen.scale. three.module.js:48585:12
THREE.PropertyBinding: No target node found for track: person_0thorax.position.

I can't find much information about the error, though using this tool the animation does play just fine so I'm sure it's something on my end.

Just in case anyone else has experience with mocap data from Theia, I feel like there must be a way to export the animation that works with things like Unity, Unreal, or Mixamo? It's so hard to find any information about it. I'd love any tips or links! Thanks

I tried exporting the model with various settings from Blender. I also tried Google but found nothing.