A common culprit is that the 'Social Tag Admin Key' has a value set in our backend but not the easy-tag you're trying to insert. The syntax to add this would be:
You can also try the following instead to see if this helps:
{JFBCLogin providers=linkedin}
Going forward, please post from the account that you have purchased your subscription from. It will help us to see more detailed information about your site from Autotune to help debug your issues. Additionally, prioritized support is for active subscribers as well.
-Melissa