[BUG] Vercel and Notion MCP server re-auth persistently failing

Preflight Checklist

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

What's Wrong?

• Vercel MCP tools return "requires re-authorization (token expired)" — reconnecting via Claude doesn't work
• Error reference: ofid_fe998bc42861554e
• Using Claude Code CLI
• Recurring issue most sessions. Silent authentication failure then unable re-auth
• Other MCP servers affected: Notion also failing repeatedly

What Should Happen?

After re-authorizing the Vercel or Notion integrations in Claude settings, the MCP server should authenticate successfully and tools should work without errors.

Error Messages/Logs

Notion error: {"error":"invalid_target","error_description":"The resource is not a valid target for this authorization server."}

Steps to Reproduce

Steps to reproduce:

1. Open Claude Code CLI
2. See notification that 2 MCP servers need authorization (Notion, Vercel)
3. Run /mcp to view which servers need auth
4. Attempt re-authorization from the /mcp dialog
5. Auth fails; must Esc out of /mcp dialog
6. Vercel error ref ID: ofid_fe998bc42861554e

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

v2.1.98

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_