Nintex Automation K2 Five for SharePoint Sorry, you don't have permissions to add apps here

When trying to add the K2 Five for SharePoint app to your app catalog site, you see the following warning and it won't allow you to add the app:

Sorry, you don't have permissions to add apps here.

Although, the environment have already been setup to support apps as per:
And the account in question is a farm administrator as well as site collection administrator.

For SharePoint apps/add-ins, the 'Create Subsites' User Permissions for Web Application is needed to add apps/add-ins.  To keep your main site ("Host Web") clean and secure, SharePoint uses a "shadow" site called the Add-in Web.  Because the Add-in Web is technically a child site, the user installing the add-in must have the Create Subsites right. Without it, SharePoint doesn't have the authority to provision that hidden sub-site infrastructure.

Grant Create Subsites User Permissions to allow the adding of SharePoint add-ins.
It can be disabled afterwards if needed.


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