Talos docs

attach-bone-unknown

Since 0.7

the attach component's bone is not a bone of the owner's skeleton, by the rig's own name or a canonical name in its retarget.map

Plain text
Severitywarning

Meaning

the attach component's bone is not a bone of the owner's skeleton, by the rig's own name or a canonical name in its retarget.map

Fix

use a name the message lists (the rig's own bone names)