1, the application no longer provides support: Duoduo has stopped providing downloads in the Apple App Store or has been removed from Apple for some reason. In this case, you will not be able to find and download the application in the Apple App Store.
2. Device compatibility problem: Duo Duo does not support device model or operating system version. Make sure that the Apple device meets the minimum system requirements of the application, and try to update the device for higher compatibility.