I'm struggling to activate the K2 app on a SharePoint 2013 site. When I "Manage App Activations" from the SharePoint App Catalog, the subsite is activating successfully, but the parent site remains in "to activate" status on every attempt. (See attached image.)
What can I do from here to activate the app? Any clues?
Another thing what you can test is, that you navigate to the following site (<siteCollUrl>/Lists/K2 Settings) and delete the Solution_Designers and Solution_Participants.
This solved the problem on my side.