Hello, i hand the same problem, this is how i solved it :
in my function.php i added a hook to change the return of the “get_option(‘fbmcc_pageID’)” i work with wpml but i this this can help you
add_filter( 'option_fbmcc_locale', function($fbmcc_locale){
if(ICL_LANGUAGE_CODE == 'fr') {
$fbmcc_locale = 'fr_FR';
} else if(ICL_LANGUAGE_CODE == 'en') {
$fbmcc_locale = 'en_EN';
}
return $fbmcc_locale;
});