App Tracking Transparency permission alert is not showing

I have implemented App Tracking Transparency in the project for 14.x devices.if I install very first time in 14.x version device it showing dialog once if I chose any one of the option. but it can’t see again App Tracking Transparency dialog if app is uninstall and reinstall.please help me
I was having this exact issue. Go to Settings -> General -> Reset -> Reset all settings. Your phone will shut down so restart it.

After this step uninstalling and reinstalling the app presented the ATT prompt each and every time.

Also make sure Settings -> Privacy -> Tracking -> Allow apps to request to Track is turned on.
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.
App Tracking Transparency permission alert is not showing
 
 
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