I have this issue too. Xcode won't log into my account correctly in System Preferences (aI dialogue pops up with "Unexpected nil property at path: 'Actor/relationships/providerId'") so it can't possibly be problem with my code signing settings. I can log into all the Apple websites and portals I've tried, so it's not my account.
I have an update I'd like to submit to the store, and I can't at the moment.
RossF
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