Ok, I added this code instead and now it works, pretty sure the documentation says to use what I have above for Pro and what I have below for regular, but I’m absolutely using Pro.
function my_acf_google_map_api( $api ){
$api['key'] = 'xxx';
return $api;
}
add_filter('acf/fields/google_map/api', 'my_acf_google_map_api');