Microsoft 365 Alert – Service Degradation – Microsoft Defender XDR – Users are unable to view new events in the AADSpnSignInEventsBeta table within Microsoft Defender XDR – RESOLVED

Announcements Arpan Das

11/10/2025 09:16:00 AM

NHSmail Reference: INC46677809

Microsoft Reference: DZ1184162

Issue Status: RESOLVED

Issue Description: Users are unable to view new events in the AADSpnSignInEventsBeta table within Microsoft Defender XDR

Final Update: 17/11/2025 08:50:00 AM – Microsoft have confirmed that the backfill of data affected during the impact period is completed and that impact has been remediated.

Scope of impact: Your organization is affected by this event, and users in Europe, Asia, and Australia that are trying to view new events in the AADSpnSignInEventsBeta table within Microsoft Defender XDR are impacted.

Root cause: An issue occurred during a recent platform migration to update the table for AADSPNSignInEventsBeta events, resulting in impact.

Next Steps: Microsoft are reviewing their platform migration procedures to help prevent this issue from happening again.