Certification failed with strange reason

The certification of my app failed.

Reason: "Your product must offer unique lasting value, such as interaction and variety. Content offered provides little value or variety."

However, this app provides true value for colorblind users. It allows them to interactively pick and save colors, get readable color names, and check WCAG contrast compliance.

What do I do? I can't seem to fine a place to contact Microsoft Support about this. It's lilke a maze :-/