You need to make a slight change to get this working.
1. Copy the shortcode given in the ‘Use this shortcode:’
2. Change the numeric code to match the number in the ‘Find your company ID:’ drop down.
This should worked for me.
I origianally couldn’t get the shortcodes to return, I discovered that not adding the ‘Company ID’ field caused the LinkedIn sync to fail silently. The company ID is part of the URL when you’re logged into LinkedIn.