Single page mobile redirect

Hello, I have been attempting to redirect just one of my WordPress pages for mobile users with the use of this plugin, however I have gotten stuck. This is the code I’m using so far:

<?php
if ( is_mobile() && get_the_ID(2766) ) {
wp_redirect(‘https://www.lifebyjohn.com/mobile-schedule&#8217;);
exit;}
?>

I tried adding the code in header.php, as well as using the Code Snippets plugin so that it would go in functions.php. Did I mess the code up by chance? Or am I putting the code in the wrong place? I’m a relative newbie so patience with me would be appreciated ??

Thanks!

https://www.ads-software.com/plugins/php-browser-detection/