Base assault system - need help how it works

I am bit confused here. Update notes say FNIX build bases. There are command tokens what you can earn by destroying FNIX base. Completed those missions 2 times. (mission chain reset after first time playthrough of missions)
Only problem there is no FNIX bases. I dont have a slightest clue how the system works, and when those FNIX bases appear.

Marshland Region level is gone up from 14 → 20, and couple of new Rivals has spawned. Nothing else. Threat level is 0.

Simple question, how does this system work? What has to be done to get bases spawn?

8 posts were merged into an existing topic: FNIX Base spawn rate