Image size for sharing on social media

Hello,

I used this filter to change the image size but it is not working:
add_filter( ‘aioseop_attachment_size’, ‘change_aioseop_aioseop_attachment_size_size’ , 10, 1);

function change_aioseop_aioseop_attachment_size_size( $size ){
return ‘medium’;
}

Could you please advice if I using the correct filter.

Thanks