This appears to be related to the Two-Factor Authentication required for the AppStoreConnect. Every time the MacOS is updated, I have to re-authenticate with the App Store. If I try and upload an app, it fails to connect, because it requires two factors, and Xcode is not equipped to deal with it. You have to do that through Safari or similar web app. Once authenticated through Safari, you also need to restart Xcode, because once it decides you are not authenticated, it never actually tries again. It requires a restart of Xcode to get it to attempt to connect to the App Store. A reboot is not required, just restarting Xcode. Good luck.
Vinderkay
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