When I arrived the washer was not spinning, and the sensor light was flashing when I put it in a drain/spin cycle to test it.

The tech sheet is located inside the washer taped to the inner front panel, after you raise the top you will see it. This video shows you how to raise the top.

Go into diagnostics and retrieve the codes, and clear them. If, when in diagnostics the codes are F7E1, F7E5, or motor speed codes, then chances are it is a motor, capacitor, or shifter related issue. Once the codes are cleared, put the washer into a manual diagnostic test and run the HEAVY AGITATION; if after 15‐20 Seconds the motor runs then you can rule out the motor, capacitor, control.

I removed the old shift actuator and installed the new one and it’s fixed!

Here’s the shift actuator for this model:
Shift Actuator W10913953