I have an iPad app that we just added iPhone support to. It runs fine on the iPhone devices we've tested on.
When we try to distribute the app by uploading it to App Store Connect the build doesn't show up in the TestFlight iOS Builds and we get an email from Apple Developer Relations that says this:
"Please correct the following issues and upload a new binary to App Store Connect.
ITMS-90891: Missing required icon - The bundle does not contain an alternate app icon for iPhone / iPod Touch of exactly '120x120' pixels, in .png format for iOS versions >= 10.0. To support older versions of iOS, the icon may be required in the bundle outside of an asset catalog. Make sure the Info.plist file includes appropriate entries referencing the file. See https://developer.apple.com/documentation/bundleresources/information_property_list/cfbundleicons
Apple Developer Relations"
We have followed the instructions on the web site and we have followed the instructions on other posts in this forum but nothing works. We have icon files in the plist file that are 120x120 pixels. We've tried renaming them. We have an app icon set with all of the iPad and iPhone icons in it. Does anyone know what specific entry in the plist file this is referring to and exactly what must be entered to make it work?