i made an armature to my model (human), did all the parenting etc. i used empty weights and applied the weights to the vertex groups manually in edit mode because auto weighting didn't work out so well (the auto weighting is not there anymore. i made a new armature from a backup file w/o any armature work on it because i knew i would screw up eventually).
as you can see, the mesh doesnt follow the armature, though it is certainly influenced by it.
and these are the vertices (including front and back of the hand; used x-ray) i selected for the vertex group. pasteall file: https://pasteall.org/blend/0d726d4ea3994c59a574ad8fd836ccb9