Microsoft prohibits ad or site content that attempts to mislead users or could be reasonably perceived as deceptive, fraudulent, or harmful. This is a broad enforcement category.
Bait-and-switch pricing where landing page shows different price than feed; fake countdown timers; spoofed brand pages; phishing-style call-to-action; or deceptive shipping/return claims. Also caught: "free trial" that auto-enrolls into recurring billing without disclosure.