ankoarti Did you select the Head
bone first? The headfrontcontrol
bone can constrain the Head
bone, but not the other way around. In versions up to Spine 4.2, the transform constraints of the parent bone cannot target the child bones. This specification changed in version 4.3 beta, allowing child bones to be specified as targets (called "sources" in version 4.3).
If this does not seem to be the case, could you please send us a Spine project via email that reproduces the issue so that we can accurately identify what else might be causing the problem?: contact@esotericsoftware.com
Please include the URL of this forum thread in the email so we know the context. Then we can take a look at what's wrong.