The title say it all, play a game in private squad instance, now play one in public squad instance. Yes, those npcs having a blue and red flag icons are missing.
Proof the challenges are intended to be in public squad:
"Mission complete! Challenge Rank: Bronze (0/3 challenges)" !!!
Shiny links, take a look!
->Ideas: Housing , Designing a new lounge , New GameMode
->Project: ASURAN/PRIMORDIUS EXPANSION available on WIKI.
->NEW: Crucible of Eternity path 4: Legacy on WIKI