Direct answer: what advertisers can implement
Microsoft Advertising provides a disclaimer feature intended to surface legal, regulatory or promotional fine print without using characters from the principal marketing message. Microsoft identifies two layouts: a popup and an inline treatment. The popup appears as a clickable label that opens the full disclosure, while the inline treatment adds a disclosure line below the ad with a link to further information. The announcement discusses the feature in the context of Responsive Search Ads, Performance Max and Audience ads across search and native placements.
One boundary is explicit: Microsoft describes the popup layout as available for Native ads and allows up to 500 characters there. It also lists selectable link labels such as “Disclaimer,” “Disclosure,” “Offer Details,” “Safety Information” and “Terms Apply.” Microsoft does not say that adding a disclaimer guarantees legal compliance, nor does the announcement give a complete country, account, device or industry eligibility matrix. Treat the feature as a delivery control, not as legal advice or automatic approval.
