Yes it does, numbers being squawked are irrelevant
Perhaps you have an airframe masking issue. tbh Youd be better off with a Pilot Aware unit, they pick up a wider variety of traffic and arent as flakey as SkyEcho plus you can easily fit remote antennae
P.S. what are using to display the traffic info?, whatever you use needs to be set up to pick up from the device and set parameters such as range and altitude differences