Flying in Shadowlands

How? I am level 60 and already doing the Ardenweald quests. I’ve opened the seat of Primus or whatever it was called. I’ve never been told about or offered to join a Covenant. I tried jumping down the slipstream in Oribos but it just teleports me back to the platform. I read somewhere that the whole thing unlocks in the Maw, but I can’t get back.