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so here is the situation:
I'm doing this all in pose mode
created an armature system
added a bone called > Properties
added a custom properties to this bone (bone properties)
copied the data path (Shift + Ctrl + C)
selected another bone > this bone has a rotation constraint > influence
add driver to that influence channel
driver settings
averaged value
object > armature
bone > tried to paste the data path
doesn't work > error > failed to find "
this worked before, im using blender 3.3 here
After some experimentation, I'd agree that the following is a tad screwy. It has to do with how (in python scripting) you traverse the object and armature hierarchies to get to their custom properties.
If you define a bone-CP when in Edit mode, the cp path must be referenced via the Armature. If you define a bone-CP when in Pose mode, the cp path must be referenced via the object:
Why? Just to confuse and frustrate us? Example file with both defined on the "thigh.L" bone and driver on the "upper_arm.L" bone: 
It would have been easier if you had "Copy as new driver" (instead of copy-data-path), and then paste driver into the influence field!
