Can't fast travel to Promethea from Sanctuary

Just done the side quest for Ava (the secret diaries one) now i can’t get back to Promethea as it still doesn’t come up on sanctuary fast travel, though that’s where I’m directed to go to, the portal in Ella’s garage won’t change from Athena.
I know the game is vast and expect it to be buggy, but with fast travel, that’s kinda basic.
rob