This option does not exist. None of these steps work, nothing shows up. There are no guides.
Useless and inaccurate:
https://itunespartner.apple.com/en/apps/news/100002351
As an experiment, I created a group and did not add any users.
- Selected the group, then selected the invisible tab with "Builds".
- Then was able to select a build.
- Went back to Testers, still shows no builds. I have a build fully processed, I was actually able to easily install it with TestFlight, however, many of my testers have no idea how to do this so a public link makes sense.
- No option to Enable anything.
Read this:
https://developer.apple.com/testflight/
"To take advantage of TestFlight, first upload a beta build of your app in App Store Connect. Then add the names and email addresses of people you’d like to test your app or enable a public invitation link in the TestFlight section of your app's page in App Store Connect."
What section? Where in the TestFlight section? Doesn't exist.
So... hmm....