Abstract:
On November 13, local time, artificial intelligence company Anthropic confirmed that its AI assistant Claude had another service interruption problem. The company said it is currently investigating the failure and has disclosed some preliminary information.
It is understood that before this incident, the Microsoft 365 platform had just experienced one of the largest service interruptions in recent years. Affected services include Exchange Online, Outlook, SharePoint, and some Teams features. According to reports, related services were down for nearly a day and a half. Earlier in the day, a senior Microsoft executive publicly apologized and expressed regret for not being able to resolve the issue for so long.
Within this context, Anthropic noted that the issue was related to its Microsoft 365 connector and has issued multiple rounds of status updates.
In its initial advisory, Anthropic said the Microsoft 365 connector was experiencing increased error rates and slow response times. Requests to access email, SharePoint, Teams chat, and calendar through this connector may fail, and new connections may not be completed.
Subsequently, Anthropic said it had confirmed that the problem originated from the upstream service provider. As a result, most requests to mail, calendar, and search tools will fail, and new connection establishment processes may also fail to complete. The company said it is maintaining communication with relevant suppliers and will update as more progress is made.
In a follow-up update, Anthropic further stated that it was still working with upstream vendors to address the outage. Mail, calendar, and search features in the Microsoft 365 connector continue to break for most requests. At the same time, Claude for Outlook has also been affected. Mail and calendar-related operations may not be performed properly, and some users cannot even open plug-ins.
Anthropic has since made it clear that the outage was caused by a Microsoft 365 service incident. The company said that mail, calendar and search tools in the Microsoft 365 connector are still unavailable in most cases, and Claude for Outlook continues to be affected. Anthropic recommends users to pay attention to Microsoft's official status page to learn about the progress of fixing the problem, and said it will update the announcement after the service is restored.
However, just as the Microsoft 365 connector issue has not been completely resolved, Claude's own platform has encountered new service interruptions. Anthropic confirmed that claude.ai, Claude Code and platform.claude.com are all experiencing increased error rates.
According to the company's statement, this new fault directly affected the user authentication system, causing the user authentication function on the relevant platform to not work properly, and some users were unable to log in and use services smoothly.
At the same time, data on the fault monitoring website DownDetector also shows that the number of user problem reports related to Claude has increased significantly in a short period of time, reflecting the wide impact of this service anomaly.
As of the time of the report, Anthropic was still investigating the specific cause and promised to continue to update users on the latest developments as more information becomes available.
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