These quests are only available while the Invasion event is active in that zone. As the Invasion in Highmountain has ended, that's not going to be available to pick back up again.
The next time an Invasion is going to be active is roughly 4 hours away and will be in a different zone.
Wowhead have an awesome little tracker for these in the "Today in Broken Isles" section of their frontpage that can help you work out when the next one will be up.
Animalu
5 years ago
5 years ago