PeePee Pleb
Lieutenant
I've succeeded the same, but unfortunately, I've found a guide for FE troops in PE too late. It's really much complicated than those well known troops you can get ahead your age. Do not repeat my mistakeSometimes it's a matter of taking provinces out on the continent. Once you take a certain one or scout it, you can sometimes unlock that Era's quests. I've gotten EMA troops in Iron, Colonial in LMA, and Industrial in Colonial simply by negotiation and taking those future Era provinces. Good Luck!