AppStore version showing "The developer of this app needs to update it..." for some customers after iOS 15 update

Hello, our Application shows the "*** Needs to Be Updated - The developer of this app needs to update it to work with this version of iOS.", but only on some devices. We had reports from customers that they get the message once they upgrade to iOS 15 and try to start the application but for most customers (and on all the devices we tested on) this message does not appear and the app works normally with the iOS 15 update. The version currently in the store was built with Xcode 12.4. We will update the App soon, but there is still lots of testing and some fixes to be done. Any help on how to troubleshoot this would be appreciated.

AppStore version showing "The developer of this app needs to update it..." for some customers after iOS 15 update
 
 
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