At 14:00 UTC, every service in every region started failing authentication simultaneously. No deploys happened anywhere. What failure classes produce a synchronized global break, and how do you confirm the culprit fast?

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Stay specific. One example, told well, beats three told fast. Make your decisions visible — what you chose between. End on what changed, for whom.

At 14:00 UTC, every service in every region started failing authentication simultaneously. No deploys happened anywhere. What failure classes produce a synchronized global break, and how do you confirm the culprit fast?

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