App Card will not show although the validation works


I have a Question. We have followed the App Card Meta tages and uploaded to our page. we also used the card validation for and it was working fine

In the log validation said

INFO: Page fetched successfully
INFO: 25 metatags were found
INFO: twitter:card = app tag found
INFO: Card loaded successfully

Also it says that * is whitelisted for app card

So i wonder … why when i user the twitter Share in my app and i include the app card. it shows me the link and not the app card? it seems the appcard does not work

I look forward for your feedback