Investigating - Incident Summary: We are currently observing an elevated rate of 503 'Service Unavailable' responses impacting CDM. Microsoft have confirmed that this is not expected behaviour and forms part of an ongoing investigation within the Microsoft Commercial Cloud service. Root cause is attributed to Microsoft service-side.
IAM Cloud Services Affected: Cloud Drive Mapper, v3.x versions
Current Impact: Multiple customers are experiencing repeated 503 responses leading to performance degradation. The issue is being experienced globally, although not consistently across all tenancies.
It is important to note that this issue is distinct from throttling. Microsoft have confirmed that throttling mechanics have not changed and that excessive calls to MS Graph will still generate 429 ‘Too Many Requests’ responses prior to 503 ‘Service Unavailable’ errors being generated. For users impacted by the current issue, there are no 429 errors returned, and our investigations show that tenancy-level MS traffic limits are not being exceeded. The 503s are unexpected and are abnormal.
Resolution Status: We have escalated the issue with Microsoft to the highest possible level based on customer impact. Microsoft has acknowledged the issue and confirmed an active investigation. No estimated time for resolution has been provided.
Recommended Action: Please contact our Support Desk if you are being impacted by this issue.
We encourage customers to raise support requests direct with Microsoft to ensure their tenant impact is captured as part of the ongoing investigation. When contacting Microsoft Support, we recommend referencing the ‘ongoing internal Microsoft Engineering team investigation into an unexpected increase in 503 responses in SharePoint Online calls in Commercial Cloud beginning in the last week of February’.
Fix ETA: As yet Microsoft have not provided a fix ETA.
Next update: We are continuing to monitor the situation closely and will provide updates as Microsoft shares further information.
Mar 18, 2026 - 17:22 UTC
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Cloud Drive Mapper
Degraded Performance
90 days ago
99.98
% uptime
Today
Office 365 Availability
Operational
90 days ago
100.0
% uptime
Today
Cloud Drive Mapper legacy
Operational
90 days ago
100.0
% uptime
Today
Cloud Drive Mapper
Degraded Performance
90 days ago
99.96
% uptime
Today
Iris (admin portal)
Operational
90 days ago
100.0
% uptime
Today
Password Service
Operational
90 days ago
100.0
% uptime
Today
Self Service Resets
Operational
90 days ago
100.0
% uptime
Today
Active Directory Resets
Operational
90 days ago
100.0
% uptime
Today
Authentication Service
Operational
90 days ago
100.0
% uptime
Today
Single Sign On
Operational
90 days ago
100.0
% uptime
Today
Smartlinks
Operational
90 days ago
100.0
% uptime
Today
Office 365
Operational
90 days ago
100.0
% uptime
Today
Identity Service
Operational
90 days ago
100.0
% uptime
Today
Attribute Changes
Operational
90 days ago
100.0
% uptime
Today
New Account Creations
Operational
90 days ago
100.0
% uptime
Today
Operational
Degraded Performance
Partial Outage
Major Outage
Maintenance
Major outage
Partial outage
No downtime recorded on this day.
No data exists for this day.
had a major outage.
had a partial outage.
Related
No incidents or maintenance related to this downtime.
Past Incidents
Mar 18, 2026
Unresolved incident: Microsoft service issue causing 503 ‘Service Unavailable’ responses from SharePoint API.