So as the title says, I am trying to pre-release an ios8 app. The app is uploaded successfully from the archive and appears under pre-release. I press on submit for beta release and add internal test users. In testflight the app appears, but when I press install it says:
"Could not install app, testflight is currently unavailable. Try again later".
This makes no sense. I tried recreating the developer profiles, I tried it on different devices with different account... always the same. Any ideas?
Yes. To install apps outside of the app store, the install process has a provisioning profile that includes the UDIDs of the devices the app can be installed on. This a requirement of any install outside of the store, hence TestFlight requires this.
Install TestFlight on the iOS or iPadOS device that you'll use for testing. Open your email invitation or tap the public link on your iOS or iPadOS device. Tap View in TestFlight or Start Testing; or tap Install or Update for the app you want to test.
There are many tools you can use to install an IPA file on your device. The most prominent application to do this is TestFlight. TestFlight essentially allows you to install and run an IPA build on your iOS device. You essentially need to invite users to your App Store Connect account as internal testers.
I re-downloaded the distribution profile for the app and re-archived the app. Now TestFlight works. Make sure that you select a Distribution profile (not Development)
Full description with pictures ... https://stackoverflow.com/a/30801899/294884
I had the same issue with one application for internal users... This worked for me:
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