Currently, august 6th 2023 there is the same issue.
Cannot add external testers to my new build.
New uploaded builds have the status: Ready to Submit.
It adding the new build can be done in the App Store connect app, but when clicking Submit in the "What to test (Optional)" screen, I get an error message: "Connection Error", There was a problem connecting to the server. Some changes may not be saved.
Harry4466
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