Can't find Co-op Campaign maps in Arcade

[aneroid-11199]

For anyone else with this issue, wait longer, like 30-45 mins:

Arcade's amazing coop campaign

Finally found it. 30+ minute wait for the result to actually load - from being an unfilled (but not greyed out) blue box to something with text and image. Not all the maps showed up in the search, that took a while longer. And then another 10 minutes for “Create lobby” to get enabled (map dependencies). Thanks, everyone, for the help.