Enable Visual Call Parking in the Goto Desktop/Web App

I would like to enable the Visual Call Parking feature for my users to be able to park and retrieve parked calls from the desktop and web app.  When I go to Settings >> Voice >> Calls >> Parked Calls, the toggle to turn this on is disabled, and it says "Your access to the visual call parking feature has been limited by your administrator."  I am the administrator, and I can't find anywhere on the admin pages to enable this feature.  The link under that message goes to https://support.goto.com/connect/help/how-do-i-use-call-parking  where it talks about how to use the feature as a user, but there is no documentation for administrators on how to enable this feature for our users.