I'm doing the Legacy: Bladed Path quest with my Warlock so I could get some of the armor pieces, since it was the only one I didn't play with during Season of the Witch. But the portal to go to the Athenaeum is not there.
I have no other things to do before hand. The game just says to go speak with Eris in the Athenaeum.
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Hey there, do you know anyone else who has completed or is most of the way through the Season 22 questline? You could join them and load into their instance of HELM, use the portal there, and speak to Eris that way. That should hopefully fix it for you when you're on your own.