Youtube thumbnail not displayed in Website Activity

I have a website activity. The activity is for my blog (on Now blogger allows you to add video from youtube into your blog.

The problem is that when I access this website activity on my phone, the youtube thumbnail is not displayed (a small question mark kind of icon is displayed). 

When I open the same URL that I used for website activity and paste URL in normal browser in my phone, it works fine and shows the youtube thumbnail. So surely it is not a problem with the phone version. I tried opening URL on Dolphin browser, Opera browser and Android browser - All worked fine.

But with Website activity - Doesnt work.

Please advise if someone can think of a reason for this. 
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