Claude Code /ultrareview Authentication Failed on Max Plan After Login — How to Fix

What this error means

/ultrareview fails with "Authentication failed" on Max plan after fresh auth login is a Claude Code failure pattern reported for developers trying to fix /ultrareview authentication failure on claude code max plan despite successful login. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

Bug report filed 2026-05-11 on anthropics/claude-code: /ultrareview command fails with ‘Authentication failed’ on Max plan even after fresh auth login. Confirmed on latest version with preflight checklist completed.

Common causes

• Max plan subscribers encounter ‘Authentication failed’ when running /ultrareview after a fresh Claude Code auth login, blocking a core paid feature without clear recovery steps
• Bug report filed 2026-05-11 on anthropics/claude-code: /ultrareview command fails with ‘Authentication failed’ on Max plan even after fresh auth login. Confirmed on latest version with preflight checklist completed.

Quick fixes

1. Confirm the exact error signature matches /ultrareview fails with "Authentication failed" on Max plan after fresh auth login.
2. Check the Claude Code account, local tool state, and provider configuration involved in the failing workflow.
3. Verify the account session, API key, provider settings, and environment where the failing tool is running.

Platform/tool-specific checks

• Verify the command, editor, extension, or API client that produced the error.
• Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
• Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

1. Capture the exact error message and the command, editor action, or request that triggered it.
2. Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
3. Review the source evidence below and compare it with your environment.
4. Apply one change at a time and rerun the smallest failing action.
5. Keep the working fix documented for the team or deployment environment.

How to prevent it

• Keep provider/tool configuration documented.
• Record non-secret diagnostics such as tool version, provider name, model name, and command path.
• Add a lightweight check before CI or production workflows depend on the tool.

Sources checked

• https://github.com/anthropics/claude-code/issues/58139

Evidence note: Bug report filed 2026-05-11 on anthropics/claude-code: /ultrareview command fails with ‘Authentication failed’ on Max plan even after fresh auth login. Confirmed on latest version with preflight checklist completed.

Related errors

• Claude Code auth token expired unexpectedly
• Claude Code Max plan features not accessible after login
• Claude Code /review command authentication error

FAQ

What should I check first?

Start with the exact /ultrareview fails with "Authentication failed" on Max plan after fresh auth login text and the smallest action that reproduces it.

Can I ignore this error?

No. Treat it as a failed Claude Code workflow until the root cause is understood.

Is this guaranteed to have one fix?

No. The imported evidence supports the troubleshooting path above, but tool behavior can vary by account, plan, version, provider, and local configuration.

How do I know the fix worked?

Rerun the same command, editor action, or request. The fix is working when that action completes without /ultrareview fails with "Authentication failed" on Max plan after fresh auth login.