[BUG] OAuth login fails: Unknown scope user:mcp_servers

[guzhiling]

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?

Claude Code 2.1.75+ requests scope user:mcp_servers which the auth server rejects as unknown. Versions before 2.1.75 lack code_challenge which is now required.

No working version exists for Pro user OAuth login.

Steps to reproduce:

1. Run claude on a headless server
2. Copy the OAuth URL to a browser
3. Auth server returns: Invalid OAuth Request - Unknown scope: user:mcp_servers

Version: 2.1.87 (also tested 2.1.75-2.1.86)

What Should Happen?

unable to authenticate:

Claude Code 2.1.75+ requests scope user:mcp_servers which the auth server rejects as unknown.
Versions before 2.1.75 lack code_challenge which is now required.

Error Messages/Logs

Steps to Reproduce

Steps to reproduce:

1. Run claude on a headless server
2. Copy the OAuth URL to a browser
3. Auth server returns: Invalid OAuth Request - Unknown scope: user:mcp_servers

• 2.1.75 - 2.1.87: "Unknown scope: user:mcp_servers"
• 2.1.55 - 2.1.74: "Missing code_challenge parameter"
• 2.1.0: "Redirect URI not supported"

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

No response

Claude Code Version

2.1.86

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Other

Additional Information

No response

[github-actions]

Found 3 possible duplicate issues:

1. [BUG] Invalid OAuth Request - Unknown scope: user:sessions% #26874
2. [BUG] "Invalid OAuth Request - Unknown scope: user:i" with version 2.1.83 #38749
3. OAuth login fails with 'Invalid OAuth Request - Unknown scope: user:i' when logging into second Max account #34308

This issue will be automatically closed as a duplicate in 3 days.

• If your issue is a duplicate, please close it and 👍 the existing issue instead
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[guzhiling]

resolved by removing spaces and line breaks in the link!

[github-actions]

This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.