Hi,
I encountered an error when connecting to the Seqera MCP API.
Environment
- Operating System: Windows 11
- Application: VSCode v1.111.0
Issue
When Seqera MCP opens the browser for authentication, the login process fails with the error:
An error occurred while signing in: unknown client
The authentication method appears to use a URL Handler, but the browser tab closes immediately after opening, preventing the login flow from completing.
VSCode Output Log
2026-03-14 21:27:19.130 [warning] Error getting token from server metadata: Error: Failed to create authentication token
2026-03-14 21:27:19.144 [info] Connection state: Error 401 status sending message to ``https://mcp.seqera.io/mcp:`` {“error”:“invalid_token”,“error_description”:“The access token is missing, invalid, or expired”}
2026-03-14 21:27:29.758 [info] Stopping server seqera
2026-03-14 21:27:29.771 [info] Starting server seqera
2026-03-14 21:27:29.771 [info] Connection state: Starting
2026-03-14 21:27:29.788 [info] Starting server from LocalProcess extension host
2026-03-14 21:27:29.788 [info] Connection state: Running
2026-03-14 21:27:31.380 [warning] Error fetching resource metadata: Error: Protected Resource Metadata ‘resource’ property value “``https://mcp.seqera.io/”`` does not match expected value “``https://mcp.seqera.io/mcp”`` for URL ``https://mcp.seqera.io/.well-known/oauth-protected-resource/mcp``. Per RFC 9728, these MUST match. See RFC 9728 - OAuth 2.0 Protected Resource Metadata
Additional Notes
- Connection through Claude MCP works normally.
- The issue only occurs when using VSCode.
- I have tested on multiple operating systems with VSCode, and the result is the same.
Thank you very much for your time and help. Any suggestions or ideas on what might be causing this would be greatly appreciated!