Over the last few days I\'ve tried to set up test flight for my iOS application through iTunes connect, however, whenever, I try to switch on TestFlight, I get an error saying \
after following a hint at the Apple developer forums, I was able to solve the issue on my side. https://devforums.apple.com/thread/255047?tstart=0
It seems you have to use version numbers with max one dot: X.XX
Having multiple dots will result in the above error. So don't use X.XX.XX
Another thing you should check is that you have the beta test entitlements in your distribution profile. This essentially means you should create a new distribution profile, it will have the new entitlements automatically.