While implementing a series of managed resources under SSMGA V2 and SSM V3, resource entries in the SSM Policy Manager were verified and loaded successfully to the managed table which was in Passive Mode.
Sometime between the 'load' of the data from the SSM Policy Manager during staging activities and going live, the table mode was flipped from Passive to Active
With that, the prerequisite entries were altered from system.susbsys.table.resource to system.subsys.table.system.subsys.table.resource, causing all prereq checking to fail.