Why B2B Advertisers Are Losing Microsoft Ads Data (And What Consent Mode Does About It)
If your Microsoft Ads campaigns target visitors in the EEA, UK, or Switzerland, there is a specific compliance step that has been mandatory since May 5, 2025. Without it, a portion of your conversion data goes unrecorded, your smart bidding operates on incomplete information, and your remarketing lists may include users whose data was collected without valid consent. That step is Microsoft Consent Mode. This article explains what it does, why it matters specifically for B2B advertisers, and how to get it working without a technical team. What Microsoft Consent Mode Does Microsoft Consent Mode connects your UET tag to each visitor's consent decision. The tag reads a signal from your Cookie Consent banner, specifically the ad_storage parameter, and adjusts its behaviour accordingly. When a visitor accepts cookies, UET records the full conversion event as normal. When a visitor declines, UET switches to cookieless mode and sends only anonymised, aggregate signals. No individua...