Turn off "Allow Apps to Request to Track", select "Ask Apps to Stop Tracking" if it's asking, uninstall and install your app, and then turn on "Allow Apps to Request to Track" will showing you the ATT dialog again.
I think each app can present that dialog only once per IDFA. Thus, resetting the IDFA will allow the dialog to be shown again. I believe this change is from iOS 14.5.
yu10
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