Jira server mobile app on a dev server ... no link available

[Rick Crow]

I'm following the instructions provided here but when I download and launch Testflight, I'm not seeing a public link for the beta. We meet all the version requirements mentioned, but the instance I'm hoping to hit is a dev instance and not our primary production instance.

Is my use case not supported, or is there something else I can try to resolve our ability to test the beta app?