Inverse Kinematics Is Not Working Correctly in Quest

I'm developing a multiplayer app in Unity using the Photon engine (PUN2).  I want the player's avatar's hands/arms and head to move with the player's hands and head movements.  But what happens is that, when the second player enters the room, the avatar hands of both players lock up and don't move (the head movements seem to work ok).  This happens with an IK script I created as well as with Final IK from the Unity Asset Store.  This problem doesn't seem to happen with my Rift.  Has anyone else had this problem and can you suggest a solution?