It looks like you have more than one feed. Go to this page and enter the intended feed ID in your shortcode like this:

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Problème d’affichage des publications Facebook. Mise en cache de sauvegarde en cours.
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Erreur: The user must be an administrator, editor, or moderator of the page in order to impersonate it. If the page business requires Two Factor Authentication, the user also needs to enable Two Factor Authentication. Type: OAuthException
.

It looks like you have more than one feed. Go to this page and enter the intended feed ID in your shortcode like this:

Ce message est uniquement visible par les administrateurs/administratrices.
Problème d’affichage des publications Facebook. Mise en cache de sauvegarde en cours.
Cliquer pour afficher l’erreur
Erreur: The user must be an administrator, editor, or moderator of the page in order to impersonate it. If the page business requires Two Factor Authentication, the user also needs to enable Two Factor Authentication. Type: OAuthException
.