Testers could not download app from Firebase App Distribution

Question

We pushed iOS app to Firebase distribution and sent invitations to every tester. Our testers followed all steps and get ready to test the app. Unfortunately, the testers get

Answer 1

That message from your tester means that the tester's udid isn't in the provisioning profile of the uploaded app. When a tester registers their device with App Distribution in the tester onboarding flow, App Distribution collects the udid and sends it to you. Thus you would need to add the udid to the provisioning profile, rebuild the app and send it out again.