2 things I noticed: get_field() isn’t specifying a post to get the field from, which is necessary outside the loop:
$add_description = get_field( 'body', $post->ID );`
And to set a post meta value you should use update_post_meta(), not wp_update_post():
update_post_meta( $post->ID, '_aioseop_description', $add_description );
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