Arachne faction upgrade doesn't allow purchase

Arachne faction upgrade at lvl 6 "unlock weapons for purchase in armory via credits" top row, 3rd from left. Says, "Requirements not met", even with Arachne 7, 34K credits available, and 22, then even 28 unstable gels. Branches off Ares unlock, but says nothing of any requirements. Doesn't match ability to buy like other factions. Says nothing of any pre-requisites. Had console-server glitch soon after. Also, after exfilling, it didn't do normal cash-out screen. But did give unstable gels in Vault. Went and got more gels just to see if that helped. No. Tried signing out, restart PS5, sign back in, didn't help. Is it unwritten that one needs to buy the Ares unlock? I don't really want to waste 20 gels on the Ares.