The error shown in TestFlight is: “The requested app is not available or doesn’t exist.” The HTTP 404 mentioned below is the historical install-service response, not the wording displayed to users.
I am trying to resolve a TestFlight installation failure that appears specific to one developer account. None of the users we have tested can install our apps.
What I have observed:
- Installation of build 964 returned HTTP 404 from the install service.
- The internal tester was assigned to the build, and the build was not expired.
- TestFlight apps from another organization install successfully on the same device.
- A newer build, 969, was marked ready on November 12, 2026. I have now tested it, and it also fails to install with the same error message as before.
Account timeline:
The account was migrated from individual to organization, with migration completed on October 23, 2026. The installation issue began after the migration request but before completion. I do not know whether the migration is related; I am including the timeline in case it helps narrow down the checks.
Has anyone encountered this account-specific install-service 404? What should I check to distinguish a build or tester configuration issue from an account-side distribution issue? If this needs Apple investigation, which diagnostics would be most useful to provide privately?
I found a potentially similar report at https://developer.apple.com/forums/thread/837330, but I do not have confirmation that it has the same cause.