June Windows updates break Microsoft 365 sign-ins on Arm devices

Microsoft is investigating a new known issue causing Azure Active Directory and Microsoft 365 sign-in issues on Arm devices after deploying the June 2022 Windows updates.

The company says in a service alert that users might experience "issues signing into some Microsoft 365 services" on a Windows Arm-based device after installing updates released as part of this month's Patch Tuesday.

"Apps and services which use Azure Active Directory to sign in, might also be affected," Microsoft further explains on the Windows release health dashboard. 

According to Redmond's service alert impacted scenarios include, but aren’t limited to, the following:

• Apps and services which use Azure Active Directory (Azure AD) to sign in
• VPN connections
• Microsoft Teams desktop
• OneDrive for Business
• Outlook Desktop client

The complete list of Windows versions affected by this newly acknowledged known issue includes only the following client platforms: Windows 11 21H2, Windows 10 21H2, Windows 10 21H1, and Windows 10, version 20H2.

Redmond engineers are now working on a resolution for these AAD and Microsoft 365 login problems and will release a fix to address them with a future Windows update.

"We're actively investigating service logs and telemetry in the latest Windows security update to understand the root cause and formulate a mitigation plan," Microsoft says.

Workaround available: switch to web apps

The company has also shared a workaround for affected customers experiencing sign-in issues until a solution to this issue is provided.

According to Microsoft, users who want to keep using the affected products should switch to the impacted apps' web versions. 

"To mitigate the issue, you can use the web versions of the affected apps, such as OneDrive, Microsoft Teams, and Outlook.com," Microsoft says.

This month's Windows updates are plagued by more issues, with Redmond revealing today that users may also experience connectivity issues when using Wi-Fi hotspots on up-to-date client and server systems.

June's updates may also cause backup issues on Windows Server systems, with apps failing to backup data using Volume Shadow Copy Service (VSS) due to security enforcement introduced to address a privilege escalation security flaw (CVE-2022-30154).