we were unable to recover the access denied error from the Delphi app because at the moment
where the control is dispatched to the browser it doesn't return the error code/messages
for example 403 - access_denied
Currently, there is an OnAccessDenied event, or an OnConnect event. But other than that there is no error detection. The connection failure depends on the callback URL being reached. The error code currently differs from service to service. For requests itself, the request event will be called. With the ARequestResult.Success, or the ARequestResult.ResponseCode you can detect errors.