I've been using TestFlight for my internal beta testings, everything was set and it was working for a while. after one of the submitted binaries got rejected from AppStore review, there seems to be a problem. On any new uploaded binaries and turning on the Beta testing switch in iTunes Connect, I get the notification from testflight app that the new version is ready to be downloaded but on the app it says "UNAVAILABLE Expires in 30 days" and when I click on the beta app in TestFlight, on top it says "This version is no longer available for testing" even though the expire date is in a month from now.
Any workarounds for this?
So I solved this issue, not once but twice, apparently it's a bug.
what you have to do is turn off all the beta testings and then turn on the one you want to test, and then it works :)
来源：https://stackoverflow.com/questions/28866581/apple-testflight-this-version-is-no-longer-available-for-testing