Hello. Blender version 3.3.0 gives me the Bone Heat Weighting: failed to find solution for one or more bones error message. I cannot find the fault.
Because this forum does not support 7MB files, the blend file is here:
https://www.dropbox.com/sh/w1u7hy0thov5p0n/AAA8WjzPVIXLeBxzv6baCqQ_a?dl=0
Can anyone please help?
Scale up your mesh and armature 10 times and try automatic weights, after it you can scale down back to 1. Should help.
That helped ! Thank you!
love u bro 
One year after, thank you a lot, you have saved me, I had a sculpted head from zbrush, with custom textures painted in substance, and I was trying to put it on the the rig, finally i found your answer.
really thank you a lot