Does it show up in the modding hub, but everything is blank? Or does it not show up at all?
Edit: Derp, you already said it doesn't show up. What is your file path?
Edit 2: Also running the game with -dev on does literally nothing when it comes to your map, it is better to have it off, since it is not needed for mapping.
The .sgb is here: D:\Program Files (x86)\Steam\SteamApps\common\Company of Heroes 2\CoH2\Data\Scenarios
the .sga is here: F:\Documents\my games\company of heroes 2\mods\scenarios\subscriptions
and here, cause i wasn't sure: F:\Documents\my games\company of heroes 2\mods\scenarios\
the .mod is here: F:\Documents\my games\company of heroes 2\mods\NS1
and here, cause i wasn't sure: F:\Documents\my games\company of heroes 2\mods\scenarios\