

For iPhone or iPad without a Home button, double press the Home button and swipe App Store up from the bottom of the screen. If the problem is caused by the sluggish and buggy App Store, you could force close it from the backend system and open it again. How to Fix Redownload Unavailable with This Apple ID 2.1 Force Quit App Store When it is hard to find out the real trigger, you'd better inspect your iPhone with the workarounds below. And for most cases, it can be concluded that this issue is a system glitch or a bug. Besides, if you enabled Family Sharing and shared purchases with other Apple IDs, there might exist some mistakes in its related settings. So, it is necessary to troubleshoot these two aspects.

Just as the pop-up states, there are two main reasons that the account you are using is incorrect and the application you want to redownload is refunded.
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Why Is iPhone Unavailable to Redownload Apps
