Ascend to power/place the inscribed ultimatum

Hi!

I completed the normal and cruel campaigns with a friend, but when I unlocked the endgame maps, I can't enter them because the game says I haven't completed the campaign. The two missing campaign quests are: Ascend to Power and Place the Inscribed Ultimatum, both from Acts 2 and 3 in Cruel difficulty. However, I don’t have those keys, so I can’t access the endgame content. I'm stuck relying on the drop of Ascendancy Keys 3 and 4 without being able to access the maps generated by the waystones.

Is there anything that can be done? Thank you!