Requesting tracking authorization on iOS 14 always returns "denied"

Question

I'm trying to test the iOS 14 tracking popup. It shows up when I test it on the Simulator, but not on a real device (iOS 14.3).

I have already read this post (IDFA iOS14 returns denied without displaying auth popup). But turning on the tracking option doesn't solve my problem.

I made sure:

• To provide a purpose string (NSUserTrackingUsageDescription) in the Info.plist
• To actually call ATTrackingManager.requestTrackingAuthorization(completionHandler:)
• That the tracking (Preferences > Privacy > Tracking) is turned on

But I don't get prompted when running the app. The completionHandler gets called immediately with the .denied case.
Also, the app does not even show up on the list of apps using tracking (Preferences > Privacy > Tracking).

Answer 1

Issue is with OS so you have to update your OS to 14.5.1

Apple released iOS and iPadOS 14.5.1. According to Apple's release notes, the update fixes a bug with App Tracking Transparency that may have prevented some users from receiving prompts from apps.

Release notes for iOS and iPadOS 14.5.1

This update fixes an issue with App Tracking Transparency where some users who previously disabled Allow Apps to Request to Track in Settings may not receive prompts from apps after re-enabling it. This update also provides important security updates and is recommended for all users.

I updated OS from 14.5 to 14.5.1 and now I am getting ATT prompt on first launch.