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Anthropic investigates Claude disruptions as Microsoft outage impacts connectors

Anthropic addressed widespread Claude disruptions and authentication errors on November 13, 2026, linking elevated issues to an ongoing Microsoft outage affecting Microsoft 365 connectors.

Screenshot of a Claude error screen stating that Claude is temporarily unavailable.
Image: @ai_for_success

Users encountering Claude disruptions on November 13, 2026, were met with an error notice reading, Claude is temporarily unavailable and We're working on it — try again in a moment. According to social media updates, users reported being booted mid-session from Claude Code, facing failed login attempts, seeing OAuth request failed prompts, encountering Cloudflare errors, and experiencing startup failures across the web and desktop applications.[4][3]

Anthropic confirmed the disruption and initiated an investigation into authentication errors affecting Claude AI and Claude Code, according to NeowinFeed and Crypto Briefing. Anthropic's status page attributed elevated errors to a Microsoft outage in its second day, identifying disruptions to Claude for Outlook and the Microsoft 365 connector starting at 17:52 UTC. The same Microsoft outage also disabled Microsoft 365 connectors within ChatGPT. Reports diverged regarding core availability: while one report stated Anthropic's status page listed the Claude API, Claude Console, and Claude Code as operational, another report cited disruptions beginning at 1:33 p.m. PT impacting both the API and the Claude website.[5][1][3]

Following the disruption, Economic Times reported that Anthropic resolved a login outage affecting Claude Code, even as issues stemming from the Microsoft 365 outage continued to affect connected tools. Anthropic directed users to Microsoft's status page for further updates on the underlying connector problem and pledged to update its own status page when full restoration occurs.[2][3]

Key facts

  • Anthropic investigated authentication errors and service disruptions impacting Claude AI and Claude Code on November 13, 2026.
  • A Claude error screen displayed the message: Claude is temporarily unavailable. We're working on it — try again in a moment.
  • Users experienced mid-session logouts in Claude Code, failing login commands, OAuth request errors, and startup failures across the web and desktop applications.
  • Anthropic's status page connected the issue to a two-day Microsoft outage that caused elevated errors for the Microsoft 365 connector and Claude for Outlook beginning at 17:52 UTC.
  • The Microsoft outage also broke Microsoft 365 connectors used in ChatGPT.
  • Economic Times reported Anthropic fixed the login outage for Claude Code while the broader Microsoft 365 disruption persisted.

Sources · 5 sources

  1. CB

    Crypto BriefingArticle ·

    Anthropic investigates authentication errors hitting Claude AI and Claude Code Service disruptions in AI tools can erode user trust, hinder workflow efficiency, and potentially impact Anthropic's growth and subscription rates. The post Anthropic investigates authentication errors hitting Claude AI and Claude Code appeared first on Crypto Briefing .

    Open source
  2. ET

    Economic Times@EconomicTimesPost on X ·

    Is Claude code down? Anthropic fixes login outage as Microsoft 365 disruption continues; is Claude AI working again? https://t.co/iE1hMePCud

    Open source
  3. AG

    AGTP@AGTPinsightsPost on X ·

    Claude just went down for users worldwide today, November 13. Here's what you need to know. Reports of problems started piling up on X around midday. Users said Claude Code logged them out mid-session, and /login would not run. Others saw "OAuth request failed" when signing in, and the https://t.co/n9TokQatv1 page would not load. Some saw Cloudflare errors, and some said the web app was buggy and the desktop app and Claude Code would not start. Anthropic's status page ties the trouble to a Microsoft outage, now in its second day. The incident is titled as elevated errors affecting the Microsoft 365 connector. It began at 17:52 UTC (12:52 p.m. ET) and was still unresolved. Claude for Outlook remained affected, and Anthropic pointed users to Microsoft's status page for progress. One report said the Claude API, Claude Code and Claude Console were listed as operational. That means the status page shows the problem as limited to Microsoft-dependent features, even though many users could not log in to the app or Claude Code. Another report put the start at 1:33 p.m. PT, affecting https://t.co/xpmg9zlmv4 and the API. The same Microsoft outage also broke the Microsoft 365 connectors in ChatGPT. Key numbers: - Nov 13, 2026: date of the outage - 17:52 UTC: start time logged on Anthropic's status page - 2nd day: how long the Microsoft outage has run - Microsoft 365 connector and Claude for Outlook: services Anthropic listed as affected Anthropic says it will update its status page when service is restored.

    Open source
  4. AS

    AshutoshShrivastava@ai_for_successPost on X ·

    Claude is down 🥶 Whose agent escaped the sandbox??? https://t.co/gpylDdmDIu

    Open source
  5. NE

    NeowinFeed@NeowinFeedPost on X ·

    Anthropic has confirmed that Claude is suffering from a service disruption, again. The company is investigating and has released some preliminary details. #Claude #Anthropic #Microsoft https://t.co/Ku39W0CwyL

    Open source