Hello. Been reading here for a while now, have learned a little.

I was wondering why I cannot add praetorian guard into garrison buildings.

I made a new unit group. and done all the other stuff.

but when I add praetorian guard to a building, it doesn't work in game.

I've tried with velites and that was added to the garrison.

So I played around a little removing the unit from technology tree and even removing them from the upgrading from legionaries into praetorian guard.

I tried making them recruit-able from the first military building. This didn't work.
It's like they cannot be recruited unless they are upgraded and researched.
but I thought I removed all that stuff.

Any help?