User impact: Admins may be unable to make changes to distribution lists in Exchange Online and receive an error.

More info: Affected admins may be unable to view, add, remove, or edit users associated with distribution lists in Exchange Online and receiving the following error message:

“You don’t have permission to access this page or perform this action”.

This issue affects both the Exchange admin center and the Microsoft 365 admin center.

As a workaround, affected admins can use the Exchange Online PowerShell cmdlet “Set-DistributionGroup” to manage distribution lists.

Current status: We’ve determined that a recent update to distribution list management functionality inadvertently created a configuration conflict in a section of the service infrastructure, resulting in impact. We’re reverting the update to mitigate impact and initial indicators suggest that distribution list management functionality has been restored in West UK and West Japan regions. We’re continuing to deploy the fix across the remaining affected regions and expect deployment to be complete by our next scheduled update.

Scope of impact: Some admins attempting to modify Exchange Online distribution lists through the Microsoft 365 admin center or Exchange admin center that are served by the affected infrastructure in the West UK, West Europe, India, Southeast Asia, West Japan, or East Australia regions may be impacted.

Start time: Sunday, July 12, 2026, at 11:00 PM UTC

Root cause: A recent update to distribution list management functionality inadvertently created a configuration conflict within a subset of the service infrastructure, resulting in impact.

Next update by: Tuesday, July 14, 2026, at 11:00 PM UTC