Anthropic Investigates Login Problems for Claude.ai and Claude Code
Anthropic said on November 13, 2026, it was investigating an authentication problem affecting Claude.ai and Claude Code. The notice came during a wider Microsoft outage, though it is unclear whether the two are linked. Some users reported login trouble on X.
Anthropic said on Friday, November 13, 2026, that it was investigating a problem with users logging in to Claude.ai and Claude Code, according to a notice on its official Claude Status page.
"We are investigating an issue with users authenticating to Claude.ai and Claude Code," the company wrote. "We will provide an update as soon as possible."
The notice gave no cause and no estimate for a fix. Claude is Anthropic's AI assistant, and Claude Code is its tool for writing software.
The warning arrived while a large outage hit several Microsoft services, and that outage had not been resolved at the time of the report. Whether Anthropic's authentication trouble is connected to Microsoft's problems is unclear. Neither company has linked the two.
Reports of the login trouble were uneven. Some users said on X that they could not sign in. Others had no difficulty: a journalist at the technology site that first reported the story logged in to Claude without problems.
That mix is common in partial outages, which can hit some accounts, regions or sign-in routes while leaving others untouched. Anthropic has not said how many users were affected or where.
The story was still developing when the report was published on November 13. Anthropic said it would post further updates on its Claude Status page as it learns more.
