Users’ push notifications fail approximately five percent of the time across any Exchange Online connection method

Title: Users’ push notifications fail approximately five percent of the time across any Exchange Online connection method

User impact: Users’ push notifications fail approximately five percent of the time across any Exchange Online connection method.

More info: Most push notification failures were occurring on Outlook for iOS devices.

Final status: Our monitoring has confirmed that the reversion of the change has completed and we’ve validated remediation with affected users.

Scope of impact: This issue may have been intermittently impacting any user receiving push notifications.

Start time: Wednesday, April 24, 2024, at 12:00 AM UTC

End time: Thursday, May 2, 2024, at 9:00 PM UTC

Root cause: A recent service update intended to modernize various aspects of the Exchange Online service introduced a code regression that produced a small number of push notifications failures and caused the impact.

Next steps:
– We’re continuing our review of the impacting update to better understand the underlying cause of impact and prevent similar issues in the future.

This is the final update for the event.