Me and some friends are playing the newest version on our Fabric World.
We added the mod yesterday, the world had been generated a few weeks before that.
We need to spawn the Locations manually, is there a debug code for that?

Also: If no Location, i.e. The Grave, is found, the Moonstone Compass causes a crash on the entire Server.
A Try/Catch block should be considered.

Like any other instance where you want to load structures and such in an outdated world, you have to load new chunks with the new version of the mod, there is no debug command. Don't know why the compass crashes since it already has lots of null checks. You can try to use the locate command minecraft provides to locate the structures instead of using it.

The locate command didnt work for us, used it in 10k block distances each.
Can we force the mod to create them at a certain point?

Sounds like the mod didn't load properly, are you sure it is installed on the server and everything? Because the structures are simple datapacks so they should work like any other structure in minecraft, spawning upon loading new chunks.

Besides that, you can use structure blocks to spawn them in manually, just give yourself it via /give @p structure_block, right click it to open it's ui, click on the button so it switches to "Load" mode, then simply enter the id of the structure, for example soulsweapons:decaying_kingdom or soulsweapons:champions_graves.