I am attempting to use @TARGETTARGET to attack my tanks target with my disc priest using a modifier. The macro displays @TARGETTARGET in red, which says to me its incorrect. The macro will change to the correct icon when I press the modifier, but only if I'm not in combat. Once entering combat, the icons no longer change, and will only display my heals. I can press alt to heal myself through the macro, not the self cast key set in the interface options. I can also press ctrl and it will bring up my utility buttons.

I've tried all the modifiers with it to see if that was the issue.

it seems as though there is something hanging up the @TARGETTARGET aspect of it when in combat.