Mandatory Coop Mission

In the main missions you reach a point in Gullcrest village where you have to do 3 types of challenges in a party. As a solo player this is extremely frustrating. I'm just standing at a challenge starting point and keep inviting people randomly, so far with no success. I don't really see any option for a "general chat" where I could meet like minded individuals that are on the same mission, and there's also no group-finder feature or something similar.

This mission should be changed or taken out, it's like a roadblock.