I don't know if you found a solution yet but i just ran into this issue doing an update to an older app. The builds would not show up in itunesconnect. It seemed to resolve itself when I added a few new things to the plist based on the app features...
<string>Saving selected wallpaper</string>
... and this one...
Here's what I'm seeing:
I have 3 builds - none are processing or otherwise in an unavailable state:
Yet in the testflight lists I get nothing:
Even for internal testers there is nothing (here I don't even see the "+" button and an empty list - there is simply nothing at all):
There are no wanings, errors or other indications that anything is wrong.
It's like iTunesConnect is in an eternal state of early beta testing.
My builds are also noch appearing in testflight, only the version name.
I can add an internal user, but the status ist "-" and i can't send any invitation.
The upload is currently not working, so I had to use the application loader: