I had the same problem. In my case simply recreating the JSON Web Token (JWT) solved the problem. You can use the maps.developer.apple.com developer 'Create a Token' to recreate the token(s). I would guess that your token expired.
infosprt
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Thank you @crystalminds for the working example. It helps a lot.
I'm experiencing the same problem. It is seeing the Mac App portion but not the iOS portion.
I just did an upload to try to see if the problem is still there.
The upload WORKED!
Thank you Apple Support for looking into it and fixing it so quickly.
I just made one screen shot with Pixelmator for the required size and added it for the iPhone 8 screen shot. From my understanding iPhone 8 is not supported with iOS 17 so that size screen shot shouldn't be needed for an iOS app that require iOS 17 as a minimum. I have successfully submitted an app to the App Store 3 times now. Also, I am not sure that the current submission process requires the iPhone 8 screen size. I left mine in and it seems to be happy with it. However, I did put a note in the App Review notes to mention the placeholder screen shot added for the iPhone 8.