Access denied. You do not have permission to perform this action or access this resource.

If you are seeing the below errors in one site collection, but it is working in another:
Access denied. You do not have permission to perform this action or access this resource.

Thread 1: Access denied. You do not have permission to perform this action or access this resource.
K2 for SharePoint Configuration Not Completed
The app you're trying to reach has been removed from this site.

Do you have multiple SharePoint Web Applications with multiple App Catalog site?  Is the K2 for SharePoint app deployed to multiple app catalog sites?

If you do, you must deploy the app to the (All Paths) Managed Paths to resolve the issue as per:
https://help.nintex.com/en-US/k2five/UserGuide/current/Content/K2-for-SharePoint/AddAppMultiAppCat.htm

Special Consideration:

If you navigate to manage app deployment and delete the app installation's deployment data, make sure to click OK and retrust the app even if you do not make any changes; otherwise cancelling out will cause this error in all web applications.



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