So today's dungeon being Red Petal Bastian, it's time to catch up with all my alts, getting their (new) daily dungeons done.
Me and my OH play as a duo, companions have been mostly useful, but not here. Bastian as a tank was being ignored, seemed like he wasn't able to taunt any of the bosses.
I know they can be tanked, because when a human tank is involved it's fine.
I think The Cauldron also has this problem, and a few others. Some bosses ignore Comp tank and just focuses on the humans. This is on normal mode.
We tend to use Bastian as a tank when we have 2 DPS, he can successfully tank most dungeons. Even Veteran.