I use Skype for Business 2016 on my desktop and am trying to get the other apps such as Mail and People to use it as well. They are all either set to no association (ms-voip-pstn) or they associate the phone numbers with Skype Preview. If I remove skype preview then all of the calling associations become unset and I'm not able to set them to ****.
How do I make it so when I click on a phone number in the Mail app **** launches and attempts to call the number?