Rigify face won't rig it!

I have this character, separate meshes, head, clothes, hands… usual.
Rig is with Rigify.
But when I tell blender to rig the head, just won’t rig it… I add a sphere and it does rig it.
I don’t understand why skips the head entirely.
Tried export it as obj, fbx, reset stuff…

When I rig the sphere as head, goes fine.
If I do the head, gives me this:
Bone Heat Weighting: failed to find solution for one or more bones

Really don’t get it.

Ok, found a solution, which I didn’t find on the internet yet.
Scaling up the character and the rig will fix the issue, because vertices were too close and small for the weights to be calculated.

That almost sounds like scale hadn’t been applied to all objects (CTRL-A) and thus setting everything to 1.

Applying scale should always be done before trying any rigging/animation, etc.

Thank you! Your method worked i had the same problem, but it said “rigify incomplete! Face rig weighting Failed! See console log.” I scaled up my model and worked. Thank you again i needed this.

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You’re welcome !