We discovered a method available in App Store Connect for obtaining user activity sources, which appears to be useful. We are currently testing this method.
https://developer.apple.com/help/app-store-connect/view-app-analytics/manage-campaigns
Yuanfu
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we understand we need to "register your ad network" (documentation link).
https://developer.apple.com/documentation/adattributionkit/registering-an-ad-network?changes=_3
Since we are not an advertising company, selecting “NO” does not allow us to proceed, and we receive the message: “Please contact your ad network for more information about using AdAttributionKit.”