Actually i'm already past this. Act I is completed and Aire and Ana are already in my team. Act II has started and Zephyra asked me to go to the Elven Capitol in order to talk to the Priestess. But there I only have the shop button in the left corner.
Viewing post in Act 2 - No option in the Capital
Hmm, I suspect the event is broken. You can try to leave and then return to the elven capitol, but I don't think that will work. Have completely quit the game and then restarted? If you've done that already, try asking on the Strive discord. People there can sometimes fix a save that has a broken event.