When animating rig, Head doesn't animate

Hello devs! So I have finished my rig, but for some reason the head doesn’t want to animate, here is how animator looks like :

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Maybe there isn’t a Bone in the head. Or maybe it’s welded.

Every part that’s welded is Massless.

Is this a blender rig? If so, you should check out the weight paint on the head and make sure that it isn’t entirely blue. If it’s not a blender rig then could you make the joints visible and possibly show the explorer?