MC40 with MXC v1.33 Rings but no Vibrate

The Customer has an MC-40:

JB 01-4AJ11-0600-0007-V0-M1-090513

Kernel 3.0.31

Android 4.1.1

 

With the MCX client version R02.04.133.

 

When a incoming call is received, the device doesn’t vibrate, even though the settings instruct it to do so.

 

Is this a known issue?