The App Catalog needs to be configured using a Configuration Profile in order to authenticate and communicate with the service. A Configuration Profile is an XML file that contains settings and configurations for the service.
To configure the App Catalog, you will need to create a Configuration Profile that includes at least an authorization code. You can copy the authorization from the App Catalog Customer Portal. Once you have the code, add it to the Configuration Profile and distribute it to the devices you want to manage with the App Catalog.
You can use your existing Mobile Device Management (MDM) solution to create and distribute the Configuration Profile. The process of creating and distributing a Configuration Profile may vary depending on your MDM solution. You should consult the documentation provided by your MDM solution to learn how to create and distribute a Configuration Profile.
Check these articles to view the full preference key reference:
Preference Keys - Catalog Agent
Preference Keys - Catalog App
For a couple of popular MDM solutions, step-by-step instructions are provided:
Integrating with MDM
Or check out an example of a fully configured Configuration Profile:
Configuration Profile Example