As of right now, this seems to be working again. I was able to load my profile in Xcode Preferences and submit builds directly to App Store Connect.

I can also confirm it happens on every computer I have Xcode installed on. It's something specific with the account, as my other accounts in Xcode load just fine.

Attempted upgrading from 14.0 to 14.0.1. No change. Support ultimately told me to use Feedback Assistant, so I've submit a request in there as well.

I received a support response with a generic "have you looked at our code signing help documents" response. I have pushed back in my response explaining this is either a bug with Xcode or their backend.

Same issue here. I noticed it today as I was about to submit a build to Test Flight. I've also sent off a support email to hopefully get more notice. This seems to be a backend issue.