onAuthenticate NOT failing

My custom authentication plugin will not fail no matter what I try. I'm certain that the plugin is enabled and that it is running my code (see below). Logging in using a valid account always results in the 'Hi username' message. Any help how to debug this would be appreciated. thanks.

Code:



function onAuthenticate( $credentials, $options, &$response )

{

$response->status= JAUTHENTICATE_STATUS_FAILURE;

$response->error_message= 'Could not authenticate';

return false;

}

}

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