I struggled with my setup on my machine for a while with the minimap, I have since found doing the following steps gets me a minimap everytime now though
1. Create a brand new map, dont edit an existing one
2. Make sure that the water background is present (save project, edit json, paste in the following lines under ShowIslandNames)
"showBackground": true,
"backgroundImgPath":"./WaterTiles/instinctworld-autoscaling",
3. open edited project file in map editor again, finish map
4. Empty export folder where the map editor is, Click Export > Local Export all in the map editor
5. you should now have several jpg files, MapImg.jpg and CellImg_0-0.jpg (you will have more CellImg files if its larger than a 1x1 server)
6. Upload these jpg files to your servers ShooterGame\ServerGrid folder removing everything that was there before
7. In the servergrid.json file make sure these lines are set as follows
"MetaWorldURL": "",
"MapImageURL": "",
If its not working after that its json file related or provider issues.
As a side note I got a server through Pingperfect and it took a bit longer than a normal server to set up but everything worked straight off the bat along with clusters, kinda wish I didnt bother figuring it all out on my machine now but hey ho.