Thank you page

Since on_sent doesn’t work anymore, I have to try other ways to get to my “thank you page”. But the thank you page doesn’t appear.

I have tried to put the code below in the header en footer. But it doesn’t work.

<script>
document.addEventListener( ‘wpcf7mailsent’, function( event ) {
location = ‘https://nueenboekhouder.nl/hartelijk-dank-voor-uw-aanvraag/’;
}, false );
</script>

Can you please help with it?

The page I need help with: [log in to see the link]