Mobil App - Testflight is not available

[E-IT]

Hello,

I would like to join the BETA-test for the

Jira Server for iOS -APP for on prem server but when I try to access the Apple-Testflight link I´m getting the error:

HTTP ERROR 500

Problem accessing /join/6JbjYbSY. Reason:

    Request failed.

Can anybode help me?

Thank you und kind regards,

Florian