Hello Bank Banque,
Your Twitter Card tags on https://www.bankbanque.fr/ are indeed perfectly valid, so you just need to do “Request Approval” from the validator to get your Summary Cards enabled for your entire domain.
However, the reason why https://www.bankbanque.fr/actualites/ does not pass the validation is because there are no Twitter Cards tags on this page. Please correct this if you would like a card to appear when sharing this page, but keep in mind that you don’t actually need to request approval for that URL when your domain is already enabled.
Let us know if we can help further.