Claude code down today? Anthropic fixes login outage as Microsoft 365 disruption continues; is Claude AI working again?

After a massive outage affecting multiple Microsoft services Friday, Anthropic's AI assistant Claude is now exhibiting issues of its own. On its official page, Claude acknowledged elevated errors on claude.ai, Claude Code and platform.claude.com. "A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery. We are investigating an issue with users authenticating to Claude.ai and Claude Code. We will provide an update as soon as possible," Claude said.

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The disruption appears to be affecting user authentication, preventing some users from accessing the AI chatbot and its associated coding services. The Claude Code disruption has also triggered a spike in user complaints on Downdetector, a platform that tracks service outages based on user-submitted reports. According to the outage-tracking website, reports concerning Claude AI increased sharply on Friday afternoon. The platform recorded 2,895 reports at around 3:45 PM, compared with a baseline of just two reports.

Which Claude services are affected?

Claude, the AI chatbot from Anthropic, went down early Friday, with users unable to log in to the app or its coding tool. It hit while Microsoft was still fighting a global Outlook and Teams outage that started Thursday and has now dragged into a second day.

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Anthropic's status dashboard hinted that the disruption is not limited to its primary chatbot. Claude.ai has been marked as experiencing a major outage, while Claude Console (platform.claude.com) and Claude Code are reporting partial outages. Claude Cowork is also experiencing degraded performance. However, Claude API continues to be listed as operational.

Is Claude server down?

Yes, for many users. Anthropic posted at 4:58 a.m. Eastern that it was investigating an issue with users logging in to Claude.ai and Claude Code, its status page shows. The page lists a major outage on claude.ai and a partial outage on Claude Code and the developer console at platform.claude.com. Anthropic has not said what caused it or when it expects a fix.

Separately, Anthropic is also facing an ongoing issue with its Microsoft 365 connector. The company said the disruption was caused by a Microsoft 365 service incident, which continues to affect its mail, calendar and search tools, with most requests failing. Claude for Outlook has also been impacted.

In its latest update on November 12, Anthropic said it was working with Microsoft to resolve the issue as the upstream provider restarted the affected servers. However, the company has yet to confirm a complete resolution to the connector disruption.

Microsoft Outage Today: Is it fixed?

Amis Claude code down, Microsoft Outlook has entered its second day of outages, leaving thousands of users without access to the email platform. Reports of outages began rolling in Thursday afternoon, and according to Downdetector, over 130,000 reports were made by users regarding issues using Outlook by around 1:15 p.m. ET.

The Microsoft 365 Status account confirmed the outage on social media, saying:

"We're investigating reports of users experiencing issues accessing Exchange Online mailboxes through multiple connection methods in the Americas."

In a follow-up post, the company said:

"We're aggressively pursuing all pathways to reduce impact. We've paused all deployments, we're moving additional traffic off the affected infrastructure, and we're restarting affected servers to return them to service."

As of 5:30 a.m. ET Friday, Outlook outages continue for many users. At 5:28 a.m., the company posted an update:

"Recovery actions are ongoing across affected Microsoft 365 infrastructure and progressing in phases. We're seeing incremental improvement in several workloads, but service health remains variable and capacity has not yet fully returned to baseline. To protect delayed mail, we’ve extended the email timeout window to 48 hours while queue and backlog processing continues."