Some of the articles appear to be out of date when configuring a Teams Room MTR or at least when in a Teams Only environment. Maybe there are more out there using both than what Microsoft seems to be referencing as their own recommendation (Teams Only Mode vs Islands, etc.)
During the setup of an account, I ran the following command
In Teams Only, this will cause the MTR to keep trying to connect to Skype for Business and report as unhealthy in the Admin Portal. Even Microsoft Support mentions this commend should not be used in a Teams Only environment. The problem is, I have yet to find a way to remove this once added. The Disable-CSMeetingRoom does not seem to do the trick. As even after running, the MTR continues to attempt to login and the Admin Portal continues to show Unhealthy on the SfB status.