Same issue on my new individual account (enrolled October 2026). All builds of my first app process fine and show "Testing", but internal testers on two different iPhones get "The requested app is not available or doesn't exist" (2 invites / 0 installs). Submitting a build to an external group also fails with "There was an error processing your request." Feedback: FB25298826 Developer Support case: 102998773608 Thank you for looking into this.