Users may be unable to access various M365 Apps or services from portal.office.com

M365 - Staff and Student Email

Some users may be unable to access various Microsoft 365 Apps or services from portal.office.com. This is impacting users across Australia.

Please note that access to M365 services via normal desktop applications remains unaffected.

Update Title: Users in Australia may be unable to access various Microsoft 365 Apps or services from portal.office.com

User impact: Users may be unable to access various Microsoft 365 Apps or services from portal.office.com.

More info: This issue affects users accessing apps or services from portal.office.com and m365.cloud.microsoft.com.

Current status: We investigated service health telemetry and identified resource contention caused by a spike in demand on infrastructure that facilitates access to Microsoft 365 apps and services through the portal. This reduced the rate at which user requests were processed, leading to impact. We’ve implemented configuration changes to improve service accessibility. We’re seeing improvements in service health and are validating with a subset of affected users to confirm resolution.

Scope of impact: Users in Australia attempting to access or use Microsoft 365 Apps and services may be impacted. This section may be updated as our investigation continues.

Root cause: A resource contention caused by a spike in demand on infrastructure that facilitates access to Microsoft 365 apps and services through the portal. This reduced the rate at which user requests were processed, leading to impact.

Next update by: Monday, 2 March 2026 at 15:30 GMT+10 (13:39 AEST — Mar 2)

Resolution Final status: Microsoft have confirmed with a subset of reporting users, as well as theur internal telemetry that service health is stable and impact has been remediated.

Scope of impact: Users in Australia attempting to access or use Microsoft 365 Apps and services may have been impacted.

Start time: Monday, 2 March 2026 at 07:30 GMT+10

End time: Monday, 2 March 2026 at 12:30 GMT+10

Root cause: A resource contention caused by a spike in demand on infrastructure that facilitates access to Microsoft 365 Apps and services through the portal. This reduced the rate at which user requests were processed, which led to impact.

Next steps:

• Microsoft are further analyzing their service telemetry to help identify the underlying root cause of the spike in demand, as well as assessing whether additional monitoring can be implemented to help better detect similar issues in the future.

This is the final update for the event. (15:11 AEST — Mar 2)

Resolution Final status: Microsoft have confirmed with a subset of reporting users, as well as theur internal telemetry that service health is stable and impact has been remediated.

Scope of impact: Users in Australia attempting to access or use Microsoft 365 Apps and services may have been impacted.

Start time: Monday, 2 March 2026 at 07:30 GMT+10

End time: Monday, 2 March 2026 at 12:30 GMT+10

Root cause: A resource contention caused by a spike in demand on infrastructure that facilitates access to Microsoft 365 Apps and services through the portal. This reduced the rate at which user requests were processed, which led to impact.

Next steps:

• Microsoft are further analyzing their service telemetry to help identify the underlying root cause of the spike in demand, as well as assessing whether additional monitoring can be implemented to help better detect similar issues in the future.

This is the final update for the event. (14:54 AEST — Mar 2)