Im at the point in the story where Ive finished Aryths Spire, and the new map for Astryls Vale has appeared but for some reason I cant access it. When I click on the Ethernia city icon, it loads the map for Umbras Veil instead of the city map. Is there any way I can access the city and continue the main story?

with region 3+fest zones you need to exit the zone you're in before you can enter a new one- you are currently in Umbra's veil, so that's where it sends you.
Just hit the 'exit zone' button in the Veil and you'll be able to access Ethernia