"No query parameters in this request" in a parameterless query

DECLARE
    new_uuid uuid;
    new_name text;
BEGIN
    -- Generate a unique username with prefix 'Survivalist' and a random suffix
    new_name := LEFT('Survivalist' || to_char(floor(random() * 1000), 'FM000'), 20); -- Adjust length as needed

    -- Insert into user_Details, get the UUID
    INSERT INTO public."user_Details"(email)
    VALUES ('')
    RETURNING "userID" INTO new_uuid;

    -- Insert into user_Accounts
    INSERT INTO public."user_Accounts"("userID", "AccountID", "name", "server")
    VALUES (new_uuid, 1, new_name, 1);

    -- Return the new UUID
    RETURN new_uuid;
END;

  string url = $"{apiUrl}/rest/v1/rpc/create_newuser";

  // Create JSON body
  string jsonBody = "{}";

  // Create UnityWebRequest
  UnityWebRequest request = new UnityWebRequest(url, "POST");
  byte[] bodyRaw = System.Text.Encoding.UTF8.GetBytes(jsonBody);
  request.uploadHandler = new UploadHandlerRaw(bodyRaw);
  request.downloadHandler = new DownloadHandlerBuffer();
  request.SetRequestHeader("apikey", apiKey);
  request.SetRequestHeader("Authorization", $"Bearer {apiKey}");
  request.SetRequestHeader("Content-Type", "application/json");

  Debug.Log("Request payload: " + jsonBody);

  // Send request and wait for response
  await request.SendWebRequestAsync();