Facebook link : 403 forbidden

Hello,

Whenever I post links from articles on Facebook, they come this mesage: 403 Forbidden.

I saw and test about htaccess, acunetix wp security and All in one SEO, but no result.

What is wrong with this site https://www.md-progressistes.fr/irak-robert-hue-intervient-au-senat-au-nom-du-groupe-rdse/ ?

Could you help me please.

Thanks

CelineB