Not sure if solved, but in my attempt to do the same I stumbled upon your question. I’ve found a way to do it;
Add a ‘Raw HTML’ box before AND after your Icon Box.
In the before icon box, add an open anchor link, eg
<a href="LINK">
Then, in the Raw HTML box, after the Icon Box I closed off the anchor link, so
</a>
This wraps your icon box as a link.
Some more styling may be required as that whole section will be an active link, just use some CSS to clean up.
