WPF.Unavailable in MP menu

[KDN]

I did try it with mixed results.
I have a few flights of Bf vs Spits in within 20 km of airbases for both sides.
Initially, all flights in the air are WPF. I created an Aircraft in the spawn airfields and then (as it seems) I clicked in an area not beloging to any side (water) and I was presented with the BF flights which were still WPF. Then I went to the red side and repeating the process produced 4 out the 6 positions available to me to select. I repeated the process a few times going from red to blue but the blue side never became available.
It needs work or some kind of documented rational because you are never sure if it is the software incomplete/bugged or your procedure flawed