Twitter card not approved because card doesn't work on any platform

[e_longo]

I tried to submit my twitter card to the approval procedure, but it was not approved with this message:

We’re writing to you to inform you that a request from this account to have a Player card whitelisted on our Platform has been rejected per our policies (https://dev.twitter.com/docs/cards/types/player-card), specifically:
• Test your experience across all Twitter clients, including Twitter’s iPhone and Android apps, as well as twitter.com and mobile.twitter.com. Cards that do not work in all Twitter clients listed will not be approved. Your Card does not load on any platform. Please check your meta tags. Testing instructions are available here: https://dev.twitter.com/docs/cards/types/player-card#Testing_your_Card
Once these issues have been resolved, please resubmit your Player Card to our validator (https://dev.twitter.com/docs/cards/validation/validator)

I follow the instructions for testing player card reported on the quoted document, and, from my point of view, it seems works fine. My card is like this:

https://securerai-a.akamaihd.net/dl/RaiTV/programmi/media/ContentItem-29fe3b66-7ba9-4151-8154-04067b27a828-twc.html

Could someone explain to me where I’m wronging

Thanks a lot
Enio

[vincentisambart]

I don’t know if it’s the only reason it was refused, but when I try to load your page, my browser (Chrome) is stuck for more than a minute trying to download the script https://mediapolisgs.rai.it/relinker/relinkerServlet.htm?cont=826819 (and ends up failing to download it).
So you can either remove that script, load it asynchronously, or load it at the very bottom of your page.