Looks like the key’s been changed to “custom” when Auto is selected.
These are the two relevant settings, and what I recommend setting them to:
And the macros should be something along these lines:
The only things that could make that combination not work, in my experience, are
a) using healing frames like Healbot, in which case @mouseover needs to be changed to @hbtarget or VuhDo where they need to be changed to @vuhdo
b) having the keybind bound to a mouse button (m1-m4) and not using an addon like Clique or Blizz’s click casting function to bind it, because unitframes eat mouse clicks by default.