The snmptd probe is not receiving traps from a device but is working for other traps.
The traps do not even show up in the snmptd Trap Monitor.
Release : UIM 8.x, 9.x, 20.x
Component : UIM - SNMPTD
Most mibs depend upon other mibs which define calls made, and so must be loaded before the desired mib will work.
This is contained in the mib IMPORTS section of the mib.
In this case the mib requires MODULE-IDENTITY, OBJECT-IDENTITY, & SNMPv2-SMI.