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Because I was trying to accomplish what OP was trying to do, saw solutions, tried them, they did not work, then I tried my "own" solution, it has worked so I figured out it might be helpful for somebody else as well.
I have exactly the same problem. UCCX version 12.5.1.11001-348 (SU1-ES03). Supervisor is assigned to manage only one of three apps, however is able to see all three and can make changes in all three. Is this a bug?EDIT : Solved - supervisor user was ...