z/OSMF acids IZUADMIN and IZUSVR sharing the same GROUP.
z/OSMF acids IZUADMIN and IZUSVR acid can share the same GROUP(s) acid.
A user needs a GROUP and a default GROUP for OMVS.
If a user only has one GROUP associated with it per an application's security requirements, then GROUP and DFLTGRP should be the same.
If the acid has multiple GROUPS assigned to it, then you need to pick one GROUP and make it the default GROUP.