I have created some filter scopes to query in snmpcollector, to populate my devices but when I query the discovery server in snmpcollector it does not populate any devices. I have checked and I see the devices in USM.

Release:
Component: UIMSNC

Make sure that the devices are listed in USM with the key over to the right of the device. This is an indication that the device has been discovered using an snmp community that was provided in the discovery configuration. If the devices do not have the key, the snmpcollector will reject them for population within snmpcollector.