social share

hi, linkedin an facebook social sharing icons at the bottom of articles are not working if i don't create article link in a menu.
example on :
https://gigarun.xyz/component/content/article/l-informatique-d-entreprise-suivie-de-sa-conception-a-son-exploitation.html?catid=9&Itemid=101
facebook share generate error 404
linkedin don't work.
if i create an hidden menu and put a link to the article in the menu ; then it works.
Is it necessary to create a menu link for the article to do it working ?
if so : is there a way to generate automatic entries for each article in a hidden menu ?
thx for help