UNSUPPORTED_RESPONSE_TYPE

HTTP 400

What it means

The authorization server does not support the requested response type.

What to do

Use response_type=code with PKCE; this is the only response type supported by the A4 MCP authorization server.

Envelope

{
  "error": {
    "code": "UNSUPPORTED_RESPONSE_TYPE",
    "http_status": 400,
    "message": "The authorization server does not support the requested response type.",
    "remediation_hint": "Use response_type=code with PKCE; this is the only response type supported by the A4 MCP authorization server.",
    "docs_url": "https://developers.cognethics.com/errors/UNSUPPORTED_RESPONSE_TYPE",
    "request_id": "0f2c9b6e-...",
    "details": {}
  }
}

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