Outage in Tessian US
M365 Add-in impacted by Microsoft Azure Service Incident
Resolved Minor
October 09, 2025 - Started 4 months ago
- Lasted about 4 hours
Incident Report
Starting at 07:40 UTC on 09 October 2025, Microsoft experienced a service incident with Azure Front Door. Some critical dependencies of Office Add-ins, which would include the Proofpoint M365 Add-in, are served via Azure Front Door, meaning Outlook may have been prevented from loading the Add-in's code.
Impact: Some users may see latency or timeouts with the Add-in when trying to send an email.
As of 12:40 UTC, Microsoft has reported they recovered 96% of impacted resources. For additional details and impacted regions, please see:
https://azure.status.microsoft/en-us/status
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Latest Updates ( sorted recent to last )
IDENTIFIED
4 months ago - at 10/09/2025 01:45PM
Starting at 07:40 UTC on 09 October 2025, Microsoft experienced a service incident with Azure Front Door. Some critical dependencies of Office Add-ins, which would include the Proofpoint M365 Add-in, are served via Azure Front Door, meaning Outlook may have been prevented from loading the Add-in's code.
Impact: Some users may see latency or timeouts with the Add-in when trying to send an email.
As of 12:40 UTC, Microsoft has reported they recovered 96% of impacted resources. For additional details and impacted regions, please see:
https://azure.status.microsoft/en-us/status
Latest Tessian US outages
Microsoft service degradation impacting mailflow - 23 days ago
Outlook for Mac - Email Send blocked for some users - about 1 month ago
Intermittent M365 Add-in Timeouts - about 1 month ago
M365 Add-In: Silently failing checks for a subset of users - 2 months ago
M365 Add-in Impacted by Microsoft Library - 4 months ago
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