Claude Suffers Global Outage Across All Products Amid Microsoft 365 Disruption

On November 13, Anthropic's Claude suffered an across-the-board outage: the official status page showed elevated errors on claude.ai, Claude Code, and platform.claude.com, with the company confirming it was investigating authentication problems affecting user logins, marked as "investigating." Multiple users (including X users ThePeterMick and BLCNYY) reported being unable to use the service, with the web app showing "Claude is temporarily unavailable," saying the issue was being worked on and recommending a retry later. The r/ClaudeAI community opened a discussion thread to track the situation and said it would update once the incident was resolved.

Confirmed

• Anthropic's status page confirmed authentication-related errors on claude.ai, Claude Code, and platform.claude.com, with an official investigation underway
• Some users saw the "Claude is temporarily unavailable" downtime page on the web
• A separate ongoing issue: an upstream Microsoft 365 service incident raised error rates and slowed responses for Claude's Microsoft 365 connector; requests to access mail, SharePoint, Teams chats, and calendars via the connector may fail, and new connections may also be affected

Why it matters

• The authentication outage covers all of Claude's major entry points (web, Claude Code, developer platform), disrupting individual users and developers end to end
• Compounding it with the concurrent Microsoft service disruption highlights Claude's dependence on upstream third-party infrastructure; developers and teams relying on both Claude and Microsoft 365 saw workflows blocked at the same time

2026-11-13 ~ 2026-11-13 · 8 related posts

• [source] Claude hit by elevated errors on Microsoft 365 connector, Anthropic investigating — ClaudeAI-mod-bot · 2026-11-13
• [source] Claude Hit by Elevated Errors Across claude.ai, Claude Code and API Platform — ClaudeAI-mod-bot · 2026-11-13
• Claude goes down: web app shows 'temporarily unavailable' as users report outage — BLCNYY · 2026-11-13
• Microsoft and Claude go down simultaneously, taking apps offline with them — ThePeterMick · 2026-11-13
• Claude outage: login auth issues hit claude.ai and Claude Code, plus M365 connector errors — op7418 · 2026-11-13
• [source] Claude outage hits claude.ai and Claude Code auth; devs joke they forgot how to code — prasenx · 2026-11-13
• Major global outage hits Claude: users can't log in, upload files, or get responses — tekbog · 2026-11-13
• Claude.ai, Claude Code hit authentication outage as Anthropic deploys fix — YashasGunderia · 2026-11-13