Your home decor client wants to start running mobile ads within their current campaign. Some creatives are already mobile-optimized and may be already appearing across mobile websites.What's the first thing they should check within their Campaign Manager 360 account to make sure of delivery?

The first step for a home decor client to confirm mobile delivery is to examine their campaign trafficking settings in Campaign Manager 360 to see if their ads are mobile-friendly, as these settings dictate the technical compatibility between the creative assets and the user's device. Even if creatives are physically mobile-optimized, the trafficking layer—specifically the ad and placement properties—must be configured to allow serving to mobile web or app environments; this includes checking for appropriate dimensions, MRAID support for rich media, and ensuring that no targeting filters are inadvertently excluding mobile operating systems or browsers. By verifying the trafficking configurations first, the advertiser ensures that the "instructions" sent to the ad server match the mobile-ready nature of the assets, preventing potential delivery blocks before attempting to rebuild campaigns or modify account-level device settings.