This also affects me. I'm trying to test a game in an adults school and they don't know what to do with the invitation.

This also happened to me on App Store Connect. First upload of the app. Didn't get any e-mails

I had the same issue today, both on Xcode and on Transported, but it worked after I restarted the computer. It probably deleted the cached files when I did it, so doing the steps suggested above might also work.