How to get BTT to make my Magic Mouse do one-touch for left-click?

Hi,

I have installed BTT to my Mac running Mojave 10.14.6

I've clicked on the Menu Bar BTT icon, added "1 Finger Tap Left",
it shows "Gesture is Enabled" under "Magic Mouse Configuration"
. . . all seems like it should work, but it does not.

What am I missing?

Thanks!