When I ran the Windows App Certification test kit if failed on the App manifest compliance test. I’ve included this section of the report below (see below the image found below). As I did a bit of research I realized that I had app logos with white (#FFFFFE) as their background color. I had selected the Light for the Foreground text color. Basically I had white on white so the text was not visible. I changed the foreground test to Dark (see screen shot below) and the text on the logos became visible and I passed the cert test.
App manifest compliance test
Error Found: The app manifest test detected the following errors:
Impact if not fixed: Apps that violate the Windows Store certification requirements can’t be submitted to the Windows Store.
How to fix: App manifest must include valid entries for all required fields, please modify the manifest entries listed above. See link below for more information: Certification requirements