A chat room has been disabled. Perhaps a user did it through the GUI
Or perhaps you did it via PowerShell
Set-CsPersistentChatRoom -Identity “pchat.domain.com\chatroom” -Disabled $True
Now you want it back. When you run Get-CsPersistentChatRoom, you don’t see it. You didn’t remove it, you just set it to disable. Where is it?
Unless you’re one of the fortunate ones, we’ve all had our heart stop with this once as administrators. Fortunately, you’re just missing a single, but very important parameter. Try this to see your disabled chat rooms:
Get-CsPersistentChatRoom -Disabled $true