I've set up Salesforce Partner Communities for my client, however the DDP button on a custom object is not functioning.  I've switched the licenses over to the partner users, given read and edit access to all of the Nintex package custom objects, and have selected the required system permissions (as outlined in the Nintex Doc Gen documentation) using a permission set.

When the DDP button is clicked, it goes to a page saying the community is "Down for Maintenance".  Does anyone have any insight as to how I can get this to work?  Thanks