Microsoft 365 Alert – Service Degradation – Microsoft 365 apps – PowerPoint users are unable to open double key encryption (DKE) files on mobile devices – RESOLVED

Announcements Sourav Nandi

01/10/2025 08:10:00 AM

NHSmail Reference: INC46644465

Microsoft Reference: OP1162778

Issue Status: RESOLVED

Issue Description: PowerPoint users are unable to open double key encryption (DKE) files on mobile devices.

More info: Additionally, users cannot change DKE file sensitivity labels. This occurs for users leveraging both iOS and Android devices. There is no impact on other platforms where PowerPoint is supported, such as PPT for Win32.

Final Update: 31/10/2025 08:40:00 AM – Microsoft have confirmed that the fix has saturated throughout the affected environment. After an extended period of monitoring, they’re confident that the issue is resolved.

Scope of impact: Any user attempting to open DKE files or change DKE file sensitivity labels in PowerPoint on iOS and Android devices is affected.

Root cause: A recently deployed change is preventing users from opening DKE files on mobile devices or changing DKE file sensitivity labels as expected.

Next steps: Microsoft are assessing their deployment procedures to prevent similar impact stemming from future changes.