Same problem, after upgrading to the latest dongle firmware today (v.5.5.102), I can not pair the headset to the dongle by wireless, the headset is working normally in USB mode. Also, opening the dongle "Connections" from iCUE does not show the Pair button enabled, is disabled, the dongle is permanently flashing red. Here are my software versions:
iCUE - v.4.14.179
Virtuoso SE dongle - v.5.5.102
Virtuoso SE headset - v.0.17.149