Gary Stofan
Ansys Employee

OK. Yes the default MPI for 2022R2 and 2023R1 is Intel MPI MPI Type: INTELMPI MPI Version: Intel(R) MPI Library 2021.5 for Windows* OS.
It is strange that earlier MPI versions run OK without requiring elevated permissions. 

At this point, I would recommend submitting a standard Ansys support request and including the information you have found.