Another account with the same symptom. Posting exact timestamps in case the shape helps.
SYMPTOM — identical to the thread. TestFlight lists the build; tapping Install gives "You already have this app installed. Do you want to replace the current app version with the test version?"; confirming gives "Could not install [app]. The requested app is not available or doesn't exist." Ordinary App Store installs on the same iPhone and Apple Account work normally. First observed 18 September 2026.
THE EXPIRY EVENT. On 17 September 2026, builds belonging to unrelated apps on my team were all stamped with an expiration inside a three-minute window — 13:23 to 13:25 PDT — regardless of upload date or app state. Builds never submitted, builds awaiting review, and released builds expired together.
Counted against the App Store Connect API today: 638 builds carry an expiration in that window, out of 1,669 on the account. 383 of them share the single minute 13:24.
Someone upthread reported every build on their team expiring inside a four-second window on 12 August. Same shape, different date.
FRESH UPLOADS DO NOT ROUTE AROUND IT. Builds uploaded from 18 September onward receive a normal 90-day term and still will not install. Worked example — Cowming Home, App ID 6811901318, build 156 (version 1.1.0), uploaded 3 October 2026: processingState VALID, expired false, expiry 1 January 2027, attached to the Internal Testers group, export compliance answered, tester present and state INSTALLED. It will not install.
RULED OUT HERE TOO, matching what others in this thread have found:
Developer Program membership is active.
Every agreement is accepted — Apple Developer Program License Agreement issued 14 October 2026 and accepted 18 October 2026; Apple Developer Agreement accepted 2015.
No fastlane on this machine, and nothing in my own tooling writes an expiry or deletes a build, beta or prerelease resource. The only PATCH it makes to a build sets usesNonExemptEncryption.
I have an open Developer Support case, 102978347817, filed 28 September. The most recent reply pointed me at the Rejection Appeal form, which does not apply — nothing of mine has been rejected.
Filing a Feedback Assistant report now and will post the FB number here.