# Anthropic's Claude Hit by Widespread Login Failures

> Multiple incidents disrupted Anthropic services across chat, coding tools, and APIs during a major IPO roadshow.
- Title: Anthropic's Claude Hit by Widespread Login Failures | Shortify
- Summary: Multiple incidents disrupted Anthropic services across chat, coding tools, and APIs during a major IPO roadshow.
- Keywords: anthropic, claude, claude.ai, claude code, claude api, outage, microsoft 365, initial public offering, BigGo Finance
- Source: BigGo Finance — https://finance.biggo.com/news/a465115d-e7fc-4b49-8468-d7764e1c3068
- Author: BigGo Finance
- Published: 2026-11-13T11:05:10+00:00
- Read time: 1 min
- Topics: anthropic, claude, claude.ai, claude code, claude api, outage, microsoft 365, initial public offering
## Authentication Failures Hit Claude
Anthropic investigated authentication errors on Friday that blocked users across Claude.ai, Claude Code, Claude Console, and Claude Cowork.
## Claude API Remained Operational
The initial authentication disruption lasted two hours. While web and coding tools stalled, the underlying Claude API stayed online.
## Thousands of Users Reported Issues
Downdetector logged roughly 3,800 problem reports at 10:15 UTC. Anthropic did not disclose what caused the authentication failure.
## Second Outage Hit During Business Hours
A broader performance incident started at 13:09 UTC. It affected claude.ai, mobile apps, the Claude API, and connectors.
## Scheduled Tasks Suffered Delays
Anthropic stated scheduled routines ran over two hours late. Connector setup was unavailable and security scans were delayed.
## Outages Hit During IPO Roadshow
The failures occurred as Anthropic launched new tools and opened its initial public offering roadshow seeking up to $64.4 billion.
## No Root Cause Explanation Provided
Enterprise customers face disruption as Anthropic works through Microsoft 365 issues. The company has not posted a root cause explanation.
## Key takeaway

Anthropic suffered multiple service outages affecting Claude services during its initial public offering roadshow without disclosing the underlying root cause.