Get-ADReplicationFailure PowerShell DataSource

Oh, i see. I misunderstood. It's not that you're targeting systems that shouldn't be. Rather, you're targeting systems that don't have the proper cmdlet for running the commands. Not a Psh guy, but is there some sort of try block you can do to attempt to load in the cmdlet and if it fails, you could return that code and alert on it. That would at least highlight which devices aren't loading the cmdlet properly. Someone else with psh expertise chime in here because we've reached the limit of my psh knowledge.