I'm also facing this same issue. Is there a solution?
mmSimon
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The only way I was able to get a build validated was by.
Unchecking Game Center from my Certificates, Identifiers & Profiles -> App ID Configuration
Regenerate Provisioning Profiles
Re-archive & Upload
This is less than ideal but it might satisfy a time-sensitive situation ...
Weirdly enough, my leaderboard/achievement features are still working on my Test Flight build.