Planetary Gear modeling using Multibody

I am trying to implement a planetary gear model using Multibody.

When the input torque is applied to the sun gear and the ring gear is fixed, is it possible to sense the final torque output transmitted to the carrier side?

When sensing the actuator torque at the carrier-side revolute joint, the value appears as zero.

I am currently using below example model

model : https://kr.mathworks.com/help/sm/ug/model-planetary-gear-train.html

[Yifeng Tang]

In this model, the ring gear is fixed by the zero position input at the Revolute Joint 1, and the mechanism is driven by the torque input at the Sun Gear / Revolute Joint. This torque is eventually balanced by the damping at the multiple revolute joints in the gear set (see below). It looks like if you sense the "total torque", the damping torque part will be visible.

which is consistent with the angular velocity of the revolute joints.