No Featured image is working with my blog

Hi admin,

I have installed this plugin to our blog and tried in twitter to look how it is working . But nothing is coming ( no featured image ) .

In Settings
I have given twitter user name
Site ( twitter user name)

Card types : Summary Below Large image

Add or hide the Meta box: Display
Open Graph: Yes
Exerpt: No
Twitters Bot: No

Let me know if I need to any changes in this .

My blog link is https://www.olivaclinic.com/blog/acne-treatment-in-indira-nagar-bangalore/

https://wordpress.org/plugins/jm-twitter-cards/