Without knowing more about your setup, it's tough to say. But good news is the solution should be simple.

What faction are you using? What's the faction name? Map?

One thing to keep in mind, is the default options for the modules with use BLU_F and OPF_F. So you'll need to edit them to get the faction you want to spawn spawning.

Place Military AI Commander as a test. Write BLU_F in the force faction module (I like to put the drop down that says NATO to none. I also write my own factions manually).

Then place the Military Placement Civilian Obj module down. Write BLU_F in the force faction line. Make the module way "place units" instead of "objectives only" if it says objectives only.

Sync the CIV Obj module to the Commander module.

Make sure you have "ALiVE Required" and "Virtual AI" modules placed (and not synced to anything).

Test by playing the mission and seeing if BLU_F spawn. It will work.

You can only use one faction in each mil/civ objective module.

In the Commander module, you can define multiple factions for the Commander to control, but each faction needs their own individual objective modules.