The Dungeon run for Kobolds and Catacombs is not available. I am aware of the cards being unavailable to buy, but the run should still be working, right?
I cannot find the link right now, but around the time of the release of Rise of Shadows Blizzard posted that there are some issues with the solo adventures related to expansions that rotated (such as K&C). Apparently, they can be played by players who already locked them, but they cannot be unlocked by those who never played them yet.
This is unintended and they said that they are looking into this and want to fix this in a future update.
Thanks for the reply. I made a new account to start over because I hadn’t played in a while, and I’m really missing loading up the occasional Dungeon Run. Hope they fix it soon