Neon MCP fails to authenticate

[digitarald]

{
    "mcp": {
        "servers": {
            "neon": {
                "url": "https://mcp.neon.tech/sse"
            }
        }
    }
}

Error feels like it should fall back, but doesn't:

2025-06-16 18:26:38.618 [debug] [editor -> server] {"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-03-26","capabilities":{"roots":{"listChanged":true},"sampling":{}},"clientInfo":{"name":"Visual Studio Code","version":"1.101.0"}}}
2025-06-16 18:26:38.945 [info] 404 status sending message to https://mcp.neon.tech/sse, will attempt to fall back to legacy SSE
2025-06-16 18:26:40.020 [warning] Error getting token from server metadata: Error: Dynamic registration failed: Registration failed: Bad Request
2025-06-16 18:26:40.022 [info] Connection state: Error 401 status connecting to https://mcp.neon.tech/sse as SSE: {"error":"Unauthorized"}
2025-06-16 18:26:40.022 [error] Server exited before responding to `initialize` request.

[digitarald]

Intercom is also failing https://mcp.intercom.com/sse

2025-06-16 18:47:56.396 [debug] [editor -> server] {"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-03-26","capabilities":{"roots":{"listChanged":true},"sampling":{}},"clientInfo":{"name":"Visual Studio Code","version":"1.101.0"}}}
2025-06-16 18:47:57.008 [warning] Error getting token from server metadata: Error: Dynamic registration failed: Registration failed: Bad Request
2025-06-16 18:47:57.011 [info] Connection state: Error ; will retry with new session ID
2025-06-16 18:47:57.011 [error] Server exited before responding to `initialize` request.

[TylerLeonhardt]

Verification steps:

• Add Neon's MCP server
• Try to start it and go through the flow