In IOS14, you need to get permission to get the IDFA. A plugin that invokes a native dialog asking for permission to do so
https://pub.dev/packages/flutter_ios_app_tracking_permission
A plugin that asks for permissions to use IDFA in Flutter apps
add info.plist
<key>NSUserTrackingUsageDescription</key>
<string>This identifier will be used to deliver personalized ads to you.</string>
For functionality from IOS14, you need to use the IOS14 Simulator and XCODE 12.
In IOS14, you need to get permission to get the IDFA. A plugin that invokes a native dialog asking for permission to do so
https://pub.dev/packages/flutter_ios_app_tracking_permission
BSD 3-Clause "New" or "Revised" License