claude mcp login wrike fails at token exchange with "client_id must be supplied" despite pre-configured client ID being resolved

Description
claude mcp login wrike completes the OAuth authorize/redirect/callback steps successfully (auth code is returned from Wrike), but the final token-exchange call fails with client_id must be supplied, even though the debug log shows the client ID was already resolved three times earlier in the same flow via "Using pre-configured client ID."

Reproduced ~10 times in a row today, consistently failing at the same step.

Steps to reproduce

1. claude --debug-file <path> mcp login wrike
2. Complete the browser OAuth prompt (authorize access)
3. CLI receives redirect/callback successfully
4. Token exchange fails

Relevant debug log excerpt

[DEBUG] MCP server "wrike": Initial auth result: REDIRECT
[DEBUG] MCP server "wrike": MCP OAuth server cleaned up
[DEBUG] MCP server "wrike": Completing auth flow with authorization code
[DEBUG] MCP server "wrike": Returning cached discovery state (authServer: https://login.wrike.com/oauth2)
[DEBUG] MCP server "wrike": Using pre-configured client ID
[DEBUG] MCP server "wrike": Returning code verifier
[DEBUG] MCP server "wrike": Using pre-configured client ID
[DEBUG] MCP server "wrike": Using pre-configured client ID
[DEBUG] MCP server "wrike": Error during auth completion: OYt: client_id must be supplied

Expected behavior
Token exchange should include the client_id that was already resolved earlier in the same auth flow, and login should succeed.

Environment

• claude mcp login wrike, MCP server URL https://mcp.wrike.com/v2
• OAuth server: https://login.wrike.com/oauth2
• Redirect port 8080 (from config)