PMP AD sync requires two DC names to be entered but surely it would be better if it discovered this information automatically. It's certainly not impossible to decom multiple DCs and then PMP would break although I thought that the user logon was not dependant on the sync schedule config or is it?
Can you confirm if the AD logon is dependent on the sync schedule config and also how to change the DCs set in the sync schedules without having to reconfigure all of the schedules.
Better still fix the issue where we have to manually tell you where the DCs are. Its easy to use the DC locator service so why make us enter manual configurations that are bound to be forgotten at some point in the future.