ON_SENT_OK does not work

Hi,

I used to use following code in the addtional setting

on_sent_ok: “location = ‘https://www.personal-training-mittelhessen.de/confirm’;”

and I replace the code, as described, with following code in function.php

add_action( ‘wp_footer’, ‘mycustom_wp_footer’ );

function mycustom_wp_footer() {
?>
<script type=”text/javascript”>
document.addEventListener( ‘wpcf7mailsent’, function( event ) {
location = ‘https://www.personal-training-mittelhessen.de/confirm’;
}, false );
</script>
<?php
}

but the redirect after submit does not work.

How do I need to change the code? Please note, that I am not a developer.

I would be great, if you could give me the code I need to copy into functions.php

Thank you