This is by design. Only the following SNMP MIB entries are supported by Pulse Connect Secure (PCS) OS:
iveTotalHits enterprises.12532.14
iveFileHits enterprises.12532.15
iveWebHits enterprises.12532.16
iveAppletHits enterprises.12532.17
ivetermHits enterprises.12532.18
iveSAMHits enterprises.12532.19
iveNCHits enterprises.12532.20
meetingHits enterprises.12532.21