Hi, my app installed from XCode (Build & Run) has never appeared in Settings->Privacy->Tracking on my iPod Touch or iPad. Do you have anything in your Info.plist file that instructs the app to appear in this list? This is really annoying. Also found a related thread here: https://developer.apple.com/forums/thread/669490?login=true
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The thing that finally worked :-) was a "General-Reset-Reset All Content and Settings". Then when I installed my app the prompt appeared and I could select to Allow tracking. What a relief !
I then noticed that my app appeared at the bottom of the Settings page and when I tap it there's an option to disable/enable tracking at whim. The app also now appears in Privacy/Tracking. Prior to this uninstalling/reinstalling did not show my app in Settings or Privacy-Tracking.
Furthermore, when I deleted the app and reinstalled, it showed the message again and my app reappeared in Settings.
Thank goodness I could sort this out, took 2 days to try to fix it before hitting reset. The only reason I can think ATT does not work as expected is that all apps installed prior to iOS 14.4 / ATT are assumed to be set to "do not allow tracking," but the OS misses adding the app to the Settings page so there's no way of changing it. Although, this does not explain why an uninstall/reinstall of the app still doesn't work. Anyway, creating a fresh app might work (untested), but factory reset definitely does work !