As we had blogged earlier, ad unit performance has a direct correlation with the application category and the users targeted by the application. Having an ad unit associated with multiple store applications leads to ambiguity, which can result in improper ad delivery. This will have an adverse impact on your revenue and user experience. The Children’s Online Privacy Protection Act (COPPA) and other compliance requirements mandate that there is a 1:1 correlation between a store application and an ad unit.
Each ad unit must be only be used in a single store application. This requirement includes applications that target Universal Windows Platform applications, along with Windows 8.x (WinRT) applications.
We’ve reached out to developers through various means, including multiple notifications inside Dev Center. The ad delivery will soon stop on ad units used across multiple applications, so if you have any such ad units, please update! Setting up new ad units is extremely easy.
Don’t forget these following tips that can help maximize your in-app-ad revenue: