Link to category

Hi,
How are your permalinks set up?
Have a look under Settings >> Permalinks

You could try selecting Post name or something like
/%category%/%postname%/
if you select Custom structure.

Hi,
My permalink are : https://www.ovalie-innovation.com/exemple-article/ (name of article)

the URL /category/publications/ works fine, but not /?cat_ID=19

Just a couple of thoughts:
Have you tried adding the link in the visual editor?
What is the category ID for the publications category?