M365 Service Status (1 degradation at 2025-12-03 13:11)
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Users may be unable to open Excel files attached to email messages in new Outlook and receive an error
Last Update: 2025-11-28 04:26(JST)
Next Update By: 2025-12-02 05:00(JST)
Status: Service Degradation
Affected Service: Exchange Online
Users receive an error stating: “Try opening the file again later.”
This issue impacts attachments that contain non-ASCII characters. As a way to
avoid impact, users can utilize Outlook on the web or download the file locally
to manually open Excel files.
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Some users may be unable to open PDFs within SharePoint Online
Start Time: 2025-12-02 11:55(JST)
Last Update: 2025-12-03 01:05(JST)
Status: Service Restored
Affected Service: SharePoint Online
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Some users who are scheduling meetings may not receive accurate declined email messages in Exchange Online
Start Time: 2025-10-27 09:00(JST)
Last Update: 2025-12-02 03:49(JST)
Status: Service Restored
Affected Service: Exchange Online
Specifically, when users sent a meeting invitation that was declined
by a resource room, the email response may have been missing the Organizer’s
details.
While we were focused on remediation, impacted users may have been able to avoid
impact by utilizing the Auto Room Booking feature, which would show up
automatically if they have an active Copilot license when scheduling meetings
through the new Outlook desktop client, Outlook on the web, or Microsoft Teams.
After adding attendees and selecting a time for the meeting, organizers with
this feature available would see a “Add room with Copilot” button which would
enable Auto Room Booking. Once this was enabled, users would see “Copilot
Managed” and “Copilot will rebook if the room declines or the meeting was
rescheduled”. Additionally, when viewing the “Places finder”, it should also
show this feature as enabled, and when users click “Add a room or location”,
then “Browse all rooms”, users will see “Rebook declined rooms” toggled on.
In order to enable this feature, users must have an active Copilot license and
been scheduling meetings using the Outlook (new), Outlook on the web or
Microsoft Teams.
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Some users intermittently may not receive responses for their prompts in Microsoft Copilot (Microsoft 365)
Start Time: 2025-12-02 12:10(JST)
Last Update: 2025-12-02 04:01(JST)
Status: Service Restored
Affected Service: Microsoft Copilot (Microsoft 365)
Users may have received an error stating “Something went wrong” when
a response failed to generate. Requests that were successful may have completed
more slowly than usual.
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Some users may be intermittently unable to access their Exchange Online mailboxes using any connection method
Start Time: 2025-11-18 02:11(JST)
Last Update: 2025-12-02 02:53(JST)
Status: Service Restored
Affected Service: Exchange Online
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Some users in Brazil may have been unable to join Microsoft Teams meetings
Start Time: 2025-12-01 10:05(JST)
Last Update: 2025-12-02 12:15(JST)
Status: Service Restored
Affected Service: Microsoft Teams
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Some users may be unable to search or see free/busy status of others in, or connect to classic Outlook desktop client
Last Update: 2025-11-26 07:30(JST)
Status: False Positive
Affected Service: Exchange Online
Impacted scenarios include, but aren’t necessarily limited to, the
following:
– Search
– Seeing free/busy status of others
– Connecting to Exchange Online mailboxes
– Setting Out of Office (OOF) status.
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Users may have experienced intermittent issues with when joining meetings in Microsoft Teams
Start Time: 2025-11-25 04:00(JST)
Last Update: 2025-11-25 06:10(JST)
Status: Service Restored
Affected Service: Microsoft Teams
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Some users may have been unable to join Microsoft Team meetings
Start Time: 2025-11-25 04:00(JST)
Last Update: 2025-11-25 05:11(JST)
Status: Service Restored
Affected Service: Microsoft Teams
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Some users may be unable to load pages with custom apps or webparts in SharePoint Online and get an error
Start Time: 2025-11-11 09:36(JST)
Last Update: 2025-11-25 04:31(JST)
Status: Service Restored
Affected Service: SharePoint Online
The following error may have been encountered by users when
attempting to load an affected page:
An error occurred during the compilation of the requested file, or one of its
dependencies. ‘Microsoft.SharePoint.IdentityModel.SPAuthFlightController’ does
not contain a definition for ‘IsRemoveRedirectWithProofTokenOnSignInPageEnabled’
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Some users may be unable to open SharePoint Online libraries or recycle bin from navigation library links
Start Time: 2025-11-20 04:30(JST)
Last Update: 2025-11-25 02:01(JST)
Status: Service Restored
Affected Service: SharePoint Online
When opening the library or recycle bin from navigation library
links, a redirect occurred to an xml page instead of the library content, but a
page refresh displayed the content as expected.
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Some organizers may have seen that mandatory labeling wasn’t applying when creating new meetings
Start Time: 2025-01-16 03:30(JST)
Last Update: 2025-11-24 11:35(JST)
Status: Service Restored
Affected Service: Microsoft 365 suite
Impact was specific to meetings created using the Microsoft Teams
calendar and Outlook on the web using the Quick Compose pop-up. Additionally,
impact was specific to admins who had a policy applied where sensitivity labels
are mandatory, and there’s no default label configured.
Attendees saw that there was no sensitivity label applied, but they could still
access and attend the meeting without complications. Users with access to the
Outlook desktop client could use that method to avoid this issue.
