Clickable phone number in a Widget doesnt work


Okay, Smart People,

I can’t get this to work and it is driving me nuts! I am trying to add a clickable phone number to the footer in a custom HTML widget.
But, every variation I try fails to a 404 page, even on mobile.

My code:

According to every tutorial I have pulled up, this should be clickable.

However, it keeps adding"tel://6179109314"
So it goes to a 404 page.