I'm archiving my builds like normal, selecting iOS device from the device menu, and clicking Product->Archive. Once the archiving finishes, I click "Submit to App Store" in the Organizer window.
After the app successfully uploads to iTunes Connect, I enable TestFlight beta testing and try to download it to my device, at which point I get an error message:
Unable to Download Apps
"[Your app] and 1 other application could not be installed at this time.
Done | Retry
Any ideas what's going on here? I also tried running the debugger on my device, which is now listed as an "ineligible device" in XCode, even though it's running 8.3 and my deployment target is 7.0.