Microsoft 365 Alert – Service Degradation – Microsoft Defender XDR – Users’ supervised iOS devices with Microsoft Defender control filter profiles may see network connectivity losses – RESOLVED

13/01/2026 08:43:00 AM

NHSmail Reference: INC46722397

Microsoft Reference: DZ1185763

Issue Status: RESOLVED

Issue Description: Users’ supervised iOS devices with Microsoft Defender control filter profiles may see network connectivity losses.

More info: Specifically, devices running iOS 26.1 that are being updated to Microsoft Defender App version 1.1.70290103 are getting into an inconsistent network connectivity state during updates and are unable to connect to either Wi-Fi or cellular networks. The following step can be performed to recover affected devices:

A factory reset can be performed to restore access and reinstall Microsoft Defender. We recommend backing up the device information prior to implementation to ensure data is retained. More information is available in Apple’s documentation here https://support.apple.com/en-us/108931

Final Update: 09/03/2026 09:04:00 AM –Microsoft has confirmed the deployment of the fix has completed and impact has been remediated.

Scope of impact: Your organisation may be affected by this event, and some users’ supervised iOS devices with Microsoft Defender for Endpoint control filter profile may lose network connectivity. This section may be updated as our investigation continues.