Anthropic is investigating authentication failures affecting Claude AI, Claude Code and other services, as users in India report access problems and increased outage complaints.
Anthropic's artificial intelligence platform Claude experienced service disruptions on November 13, preventing several users from accessing their accounts and using its AI-powered tools.
The outage affected authentication services across multiple products, including Claude.ai and Claude Code. Users attempting to log in reported difficulties accessing the chatbot and developer tools, disrupting activities such as coding, research and everyday tasks.
Anthropic acknowledged the problem through its official status dashboard and confirmed that its technical teams were investigating the increased authentication errors.
The disruption was also reported by users in India, where complaints about difficulties accessing Claude services increased significantly during the afternoon.
The outage extended beyond Claude's main chatbot, affecting different parts of Anthropic's product ecosystem.
According to the company's service status updates, Claude.ai experienced a major outage, while Claude Code and Claude Console faced partial disruptions.
Claude Cowork also reported degraded performance during the incident.
The affected services included:
Claude.ai: Users experienced difficulties logging into the AI chatbot and accessing their accounts.
Claude Code: Developers faced interruptions while attempting to use Anthropic's AI-powered coding assistant.
Claude Console: The developer platform, accessible through platform.claude.com, experienced partial service disruptions.
Claude Cowork: The productivity-focused tool also reported performance-related problems.
These disruptions created difficulties for users who depend on Anthropic's AI products for programming, professional work, research and productivity.
Anthropic acknowledged the growing number of authentication-related errors at 9:58 UTC, corresponding to 3:28 PM Indian Standard Time (IST).
The company confirmed that it was investigating the issue but had not provided a specific timeline for restoring all affected services at the time of reporting.
The incident highlighted problems with account access across several products rather than a complete shutdown of Anthropic's entire infrastructure.
Interestingly, not every Anthropic service was affected by the outage. The Claude API continued operating during the disruption, indicating that the authentication problems were concentrated in particular parts of the company's product ecosystem.
This distinction was important for developers and businesses using Claude through API integrations, as they could continue accessing the service even while some users experienced problems with the main chatbot and other tools.
However, the availability of the API did not mean that all Anthropic services were functioning normally.
The scale of the disruption was also reflected in user-submitted reports on Downdetector. At approximately 3:45 PM on Friday, the platform recorded 2,895 reports related to Claude, compared with its usual baseline of around two reports.
The sharp increase indicated a significant rise in users experiencing difficulties with the AI platform.
However, these figures represent complaints submitted by users and should not be interpreted as the confirmed number of customers affected by the outage.
The incident attracted attention among Indian users, particularly developers, students and professionals who rely on AI assistants for their daily activities.
Alongside the authentication problems, Anthropic was also dealing with a separate technical issue involving its Microsoft 365 connector. The disruption affected Claude's integration with Microsoft's productivity services, including email, calendar and search functionality.
According to Anthropic, these tools were failing for most requests, while Claude for Outlook was also experiencing problems. The connector issue was separate from the November 13 login outage and added to the company's ongoing service challenges.
In an update published on November 12, Anthropic said it was coordinating with Microsoft to address the Microsoft 365 integration problem. The company indicated that Microsoft was restarting the affected servers as part of its recovery efforts.
However, a complete resolution had not been announced at the time of reporting.
The disruption was particularly relevant for users who depend on Claude's Microsoft 365 integration to access workplace emails, organise schedules and search information through connected services.
Anthropic said its technical teams were continuing to investigate the authentication failures and would share additional information through its official status page.
At the time of reporting, the company had not announced a confirmed restoration timeline for all affected services.
Users experiencing login difficulties were advised to monitor Anthropic's service updates for information about recovery progress.
The situation also highlighted the importance of reliable authentication systems and service availability as AI chatbots and coding assistants become increasingly integrated into everyday workflows.
Conclusion
The November 13 Claude AI outage disrupted access to several Anthropic products, including Claude.ai, Claude Code and Claude Console. Although the API remained operational, authentication failures affected users trying to access the platform. Separately, Microsoft 365 connector problems added to Anthropic's service challenges. The company is investigating both issues and working towards restoring normal operations.