I have reached the support and they handled it. It's a known issue on Apple-side, but they didn't mention the reason for that bug.

We're having the same issue. Overnight (between April 20 and April 21, 2026), every build across every one of our apps transitioned to "Expired" status simultaneously — including builds that had been uploaded only hours earlier and were well within the 90-day TestFlight window. Additionally, when we upload new builds, they process successfully and appear in TestFlight as "Complete." Internal testers receive the invite and can see the app in the TestFlight app on iOS, but tapping Install returns the following error: "Could not install app. The requested app is not available or doesn't exist."

Same issue here. Overnight (between April 20 and April 21, 2026), every build across every one of our apps transitioned to "Expired" status simultaneously — including builds that had been uploaded only hours earlier and were well within the 90-day TestFlight window. Additionally, when we upload new builds, they process successfully and appear in TestFlight as "Complete." Internal testers receive the invite and can see the app in the TestFlight app on iOS, but tapping Install returns the following error: "Could not install app. The requested app is not available or doesn't exist."