Ok. You should call enterprise support for assistance with this, they’ll be able to walk through it and figure out what’s going on. You can find support info by logging into the dashboard at publish.adobe.com and clicking on the Support link in the left list of tabs.
Bundle IDs and certificates don’t affect content download. Do you have a current DPS license or are you a trial customer? Knowing that will help me understand the best way to get you further assistance.
Make absolutely sure your Android app is built as a preflight app. The only published item in your whole project is the top level collection so if your Android app wasn't built as a preflight app the content won't show.
Also try clicking the preflight button to make sure all your content was pushed to the preflight system.
Did you create a project with two top-level collections, one for phone and one for tablets? My guess is you're testing on an Android phone and it's loading the phone TLC which you haven't put any content in.