I am trying to copy the pose of an armature to another armature. I was, unfortunately, unable to find a solution that would work for me. Both of the armatures have the same amount of bones that are named identically. I tried using the Pose -> Copy pose operator, however when I try to paste the pose into the second armature, nothing happens. Before copying the pose, I first select all of the bones. Are there some specific naming conventions that I have to follow, or could the issue be entirely different? I am importing both of the armatures from an .fbx file. Below is a hiearchy of both the armatures.
On your second armature "Armature.001", the mode "Rest Position" is enabled. That prevents you from modifying the pose.
Select "Armature.001", go to "Object Data" properties, then select "Pose position" instead of "Rest position". The Copy/Paste operation should now work as intended.
I have finally found the solution to my problem, which was unrelated to the question I asked due to the initial lack of understanding on my side. I was trying to copy the "absolute transforms" of the bones, which can be achieved by adding "Copy transforms" bone constraints to each bone. Thankfully a script exists, which automates the process and produces the results I was after.