Error in TestFlight: “The requested app is not available or does not exist.” This happens on multiple iPhones and Apple IDs. Important: Builds from OTHER Apple Developer accounts install fine on the same devices. We tried new apps, new bundle IDs, new certificates, new provisioning profiles. Internal testing fails. External testing also fails. All Agreements, Tax, Banking, and membership requirements are completed and active. When configuring external testing in App Store Connect, we also get: “There was an error processing your request. Please try again later.” This has been happening for 3 weeks. Has anyone seen an Apple Developer account / TestFlight backend issue like this? Any solution besides contacting Apple Developer Support?