Oddities
This is where i add random issues.
If a mission does not have a Scenario ID on https://reforger.armaplatform.com/workshop/62D55563549DA97A/scenarios, that mission cannot be loaded on the server.
The Scenario ID comes from the .conf file in gc-reforger-missions\Missions\{Author}\{MissionName}.conf
To Fix:
Right click and select Register. (If you don't have the Register option, then it's something completely different.)
RESOURCES : Resource file successfully registered (C:/Users/Perfk/Documents/GitHub/gc-reforger-missions/Missions/Perfk/NagalamTrafficJam.conf)
Another sign that it worked is that the .meta file will have been updated
Once merged with GC, and missions have been pushed, your missions should now have a Scenario ID again