Motor6D Enabled, But Not Active

I’m trying to add a Motor6D to an animation, essentially an extra limb, and after I finished the animation, I found out it works, except for the extra limb. It does not animate like the rest of the limbs.

I did some digging, and I found out that the Motor6D I added was different than the others in the base NPC,

The Motor6D I added:
2022-08-02 (2)
The rest:
2022-08-02 (3)

The ‘Active’ button is not ticked, but the Enabled button is. It’s greyed out too, so clicking it does nothing. How would I activate it?