On 8/17/22, SaaS Protection M365 Backups began to fail intermittently across a subset of SaaS customers, primarily for Microsoft Teams and Exchange. Beginning the morning of 8/23/22 - the frequency of these backup failures began to increase dramatically – impacting a larger cross-section of SaaS Protection customers.
The root cause of these failures was a bug introduced by Microsoft in the Exchange Web Services API.
SaaS Protection Engineering escalated this issue to Microsoft on the afternoon of 8/18/22, while in parallel exploring options to address the issue internally. Our Engineering team deployed a change that mitigated the problem on 8/24/22 at 16:00 UTC, after which Backup Success Rates quickly returned to normal levels. Microsoft deployed a fix for this issue to their service on 8/26/22.