To run the Email Router Configuration Manager, you must be a local administrator. Make sure that you are a member of the Administrator group before you start this program.
Well… this was an internal Dynamics 365 environment in which my account was a Domain Admin so I was a bit confused but I played along. Went ahead and added my account in as a local admin on the server and rebooted for good measure. That didn’t help. No matter how much I restarted the router service, rebooted, tried adding permissions, etc… it all fell on deaf ears. Googling the error message resulted in no meaningful results – which usually means 1 of 2 things – my router is completely hosed or I just uncovered a nice new bug with Dynamics 365!
After thinking about it for a few more minutes, I figured why not try running it AS AN ADMINISTRATOR!?!?! Sure enough, 3 clicks later and I was in… Easy workaround and I hope it saves some head-scratching!