Apple enables system wide tracking of all app usage, installs, and in-app purchases for themselves with a prompt to "Turn On Personalized Ads" while third-parties must show a prompt that says "Ask App Not To Track". For third-party ads to operate effectively, you need to reject the "Ask App Not To Track" prompt in both the app that displayed the ad and the app that was being advertised.
Apple enables system wide tracking of all app usage, installs, and in-app purchases for themselves with a prompt to "Turn On Personalized Ads" while third-parties must show a prompt that says "Ask App Not To Track". For third-party ads to operate effectively, you need to reject the "Ask App Not To Track" prompt in both the app that displayed the ad and the app that was being advertised.