Just an update;
By adding the following to my apps entitlements plist I can now submit builds to App Store Connect;
<key>beta-reports-active</key>
<true/>
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Same issue; none of my builds show up under Builds on App Store Connect. I get an email stating processing of my uploaded app has finished and is ready for submitting to the App Store. It has been like this for over a week now.
Emailed Apple support and got a generic reply stating I needed to clarify my problem... although I did that in my first email.