Microsoft Advertising has introduced a new guide for when ads are marked with a Made with AI watermark.
Ads display a Made with AI watermark when they use a display, image, or video asset labeled AI Content + Watermark and serve in the EU or New York State.
Advertisers can label individual assets or utilize bulk edits in Ads Studio. For feed-based ads such as Shopping offers, the label applies to the specific feed entry. Importantly, Premium Streaming video campaigns and HTML5 ads are not included in this labeling.

Microsoft also supports mapping of AI disclosures from Google Ads and Pinterest imports. The company provides separate AI Content labels that register AI use without adding a watermark.
Read the official help page spotted by Hana Kobzová here: Microsoft Advertising Help.