ok, you tried the sugestion from @SteveJG, and as we can see, the response type will now be displayed, which actually is not want you want in the end...
what you want is to get the respnse content as you had it earlier and parse the response content to display only the error, for example INVALID_PASSWORD
the response content is in JSON format, you can use the JsonTextDecodeWithDictionaries method from the web component to convert it into a dictionary
Taifun