I have also the same issue.
I solved it.
In my case, I removed latest ready for sale app version.
AppStore Connect -> My Apps -> Your App -> General ->Pricing and Availablity->Last Compatible Version Settings->iOS
Click "All" label.
Uncheck latest ready for sale app version. Click "Done".
Refresh Page.
I hope it can help you.
Suni201114
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I have the same issue.
I solved it.
In my case, I removed latest ready for sale app version.
AppStore Connect -> My Apps -> Your App -> General ->Pricing and Availablity->Last Compatible Version Settings->iOS
Click "All" label.
Uncheck latest ready for sale app version. Click "Done".
Refresh Page.
I hope it can help you.