Twitter App Card not shown


#1

I just add Twitter App Card to my web, http://wejoin.us.
It’s approved already.

The problem is that the card not shown when i try to tweet and mention http://wejoin.us on my tweet.

Some technical problem I meet when I validate my card is there are three field was not green.
Two of them are marked as required that is twitter:app:id:iphone and twitter:app:id:ipad.
That’s because i didn’t add both meta data since my app, currently only available on android.

Is that the reason why my card not shown?
If that is, what should i add on both meat data to indicate that we don’t have iPhone and iPad apps?

edit:
forget to mention when I add

<meta name="twitter:app:id:iphone" content="">
<meta name="twitter:app:id:ipad" content="">

I get some error on validator.

Thanks you for your help