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