I don’t know what to do, I’ve tried to validate my card and the validator and it says that my web is not whitelisted (arrentum.com) and after requesting approval it says ERROR: Card validation is failed. I don’t know what to do. Please help.
In your page, I see:
<meta name="twitter:card" content="Expertos_en_seleccion_imagen" />
This is not valid. You need to specify a card TYPE here. Fix that, and then try validating again.
You don’t appear to have changed your markup yet. I’ll close this thread, and if you still have issues when you have a correct format, please let us know. Thanks!