PVP action "Equanimity" does not work in macros

ISP:
Time Warner

Type of Internet Connection:
Cable

Internet Connection Speed:
4.1megabytes/s

Date & Time:
CDT time zone, but occurs all the time

Frequency:
Always

Character Name:
Jesimae Citrose

Race:
Race of your character when the issue occurred.
Hyur F

World:
Excalibur

Class/Level:
WHM50

Area and Coordinates:
All areas

Party or Solo:
Solo, and party with 8 members

NPC Name:
None

Monster Name:
None

In-Game Time:
Always

Steps:
The PVP action Equanimity cannot be trigger via macro regardless of the syntax used. Below are the variations I tried.

/ac Equanimity <me>
/ac Equanimity
/ac Equanimity <t> (with myself targeted)
The above variations but with "/action" instead of "/ac"
The above variations but with the auto-translate version of the word Equanimity
The above variations but with quotes around Equanimity

I already confirmed that the action is active in my Actions&Traits tab.
I am able to put Equanimity on my hotbar, not as a macro, and trigger it. However, there just does not seem to be any working macro syntax that will activate Equanimity regardless of the location, time, or party setup.