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I can install my app from AppStore and Xcode without any problems on all 4 of my devices which range from iPhone 12-8. However, when some customers update to the newest version, it hangs at the launch screen. I have asked them to delete and reinstall it, and they were not successful. I can not duplicate it on my devices, but I ask a few friends, and it hung. But, I do not have access to their device. I don't know where to start.

An app I submitted was rejected, so I made the necessary changes. I had an extra in-app purchase, which I was not using and when I went to delete it, I deleted the wrong. Now, I have created a new in-app subscription to replace the one I deleted, but I can not submit it for review, it is stuck on "Ready to Submit" As soon as I click "Submit for review", 1/2 second later, it automatically returns:"There was an error saving changes. Please try again later. If the problem persists, please contact us."The 2 other in-app purchases are Waiting for Review.I clicked Submit In-App Purchase and the spinner is stuck spinning next to Submitting In-App Purchase.I have turned off my mac, deleted cookies, used different browsers, deleted and added the in-app purchase again and nothing is working.