# Anthropic Claude down: Why it said it was unable to authenticate code > Source: > Published: 2026-11-13 10:46:05+00:00 # Anthropic Claude down: Why it said it was unable to authenticate code [Stan Schroeder](https://mashable.com/author/stan-schroeder) [Read Full Bio](https://mashable.com/author/stan-schroeder) It's going to be a tough day to do anything online. Following a [massive outage affecting multiple Microsoft services](https://mashable.com/tech/microsoft-outlook-outage-cause-revealed-nov-12-2026) that still hasn't been resolved, Anthropic's AI assistant Claude is now exhibiting issues of its own. "We are investigating an issue with users authenticating to [Claude.ai](http://Claude.ai) and Claude Code. We will provide an update as soon as possible," wrote Anthropic on the company's [official Claude Status page](https://status.claude.com/). [Terms of Use](https://www.ziffdavis.com/terms-of-use)and [Privacy Policy](https://www.ziffdavis.com/ztg-privacy-policy). **You May Also Like** At Mashable, we're logging into Claude fine, but we've seen [reports on X](https://x.com/SimonasLTU1/status/2121185439180534267) that some users are having trouble logging in. [This Tweet is currently unavailable. It might be loading or has been removed.](https://twitter.com/SimonasLTU1/status/2121185439180534267) It's unclear whether Anthropic's problems are related to Microsoft's troubles. *This is a developing story. We'll update this article when we know more.* Topics [Artificial Intelligence](https://mashable.com/category/artificial-intelligence) [Anthropic](https://mashable.com/category/anthropic) Stan is a Senior Editor at Mashable, where he has worked since 2007. He's got more battery-powered gadgets and band t-shirts than you. He writes about the next groundbreaking thing. Typically, this is a phone, a coin, or a car. His ultimate goal is to know something about everything.