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claude-code - 💡(How to fix) Fix [BUG] Can not LOG IN to web app or CC CLI after upgrade from Max 5x to 20x [1 participants]

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anthropics/claude-code#50824•Fetched 2026-04-20 12:12:02
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Error Message

Anthropic needs to either provide human support or address this critical issue with OAuth log in after plan modifications. I don't know if it is tied to the fact that the plan was created through IOS but it is a major error that prevents log in with a subscribed MAX 20x account email!

Error Messages/Logs

Code Example

Says "Not Found" after trying to log in on the web app and sends me to "Let’s create your account".
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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

Authentication issue where the web app and Claude Code CLI log in both direct me to the log in page but typing in my email account that's associate with my subscription plan is unrecognized. I have exhausted all options including brower cache/ deleting browser stale data, tried log in through every portal (email and Google), etc. The iPhone app continues to work and allows me to log out log back in, Chrome extension continues to work as well. This is a OAuth authentication bug seemingly on Anthropic's server side. I've tried reaching out for support through their proper channels (Fin AI) and have been in a recursive loop getting nowhere. Short of human intervention to properly look at my account and reassign the OAuth backend flow I don't know if this can get resolved. It is a MAJOR bug. Complete lock out of an account in to the most critical surfaces (CLI/ web app) AFTER upgrading to a MORE expensive plan.

What Should Happen?

Anthropic needs to either provide human support or address this critical issue with OAuth log in after plan modifications. I don't know if it is tied to the fact that the plan was created through IOS but it is a major error that prevents log in with a subscribed MAX 20x account email!

Error Messages/Logs

Says "Not Found" after trying to log in on the web app and sends me to "Let’s create your account".

Steps to Reproduce

Upgrade your plan on IOS from Max 5x to Max 20x Logout of Claude CLI, try Logging back in!

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

2.1.114 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

No response

extent analysis

TL;DR

The most likely fix for the authentication issue is human intervention to reassign the OAuth backend flow for the affected account.

Guidance

  • Verify that the issue is indeed related to the plan upgrade by checking if other users with similar plan upgrades are experiencing the same issue.
  • Try logging in through a different portal or method, such as the iPhone app or Chrome extension, to see if the issue is specific to the web app and CLI.
  • Reach out to Anthropic's support team again, providing detailed steps to reproduce the issue and any relevant error messages, to request human intervention and reassignment of the OAuth backend flow.
  • Consider providing more information about the previous working version and any changes made to the account or subscription plan to help identify the root cause of the issue.

Example

No code snippet is provided as the issue seems to be related to the Anthropic API and OAuth authentication.

Notes

The issue seems to be specific to the web app and CLI, and the fact that the iPhone app and Chrome extension continue to work suggests that the issue may be related to the OAuth authentication flow. The recursive loop with Fin AI support suggests that human intervention may be necessary to resolve the issue.

Recommendation

Apply workaround: Reach out to Anthropic's support team again and request human intervention to reassign the OAuth backend flow, as this seems to be the most likely solution to resolve the authentication issue.

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#api#embedding generation#cache error#pipeline error#authentication issue

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