Content not unlock with linkedin social button

Dear Plugin Author,

I am using your plugin on one of my website and I want to unlock the content with Linkedin Social button. But when I have tried to unlock the content then my post shared on the my Linkedin profile but content not unlocked. You can check the working example
http://rndexperts.com/rumble/

I am new in wordpress and want your help. Its really appreciate if you can check the issue and let me know the exact reason although plugin working with another social icons.

Looking forward for your positive and quick reply.

Best Regards,
Devinder

https://wordpress.org/plugins/social-locker-content/