Using a System Account does not work when installing the K2 for SharePoint app and providing trust. A User Account must be used.
After the K2 for SharePoint app is deployed to the App catalog and it is added to Site Contents, an error occurs on Trusting the K2 Application.
It is best to grab the correlation ID from the error being shown and looking at the ULS logs with that Correlation ID. This should give an error like Unauthorized or Access Denied.
- Log in with a User account that has Site Collection admin rights on the App catalog and is a Farm administrator.
- Try adding the app in Site Contents with this account.
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