FLS-H lp pairing

I have had a FLS-H anti-parallel ballast running for a long time. Today it decided to drop off and I have been unable to pair it again.
It pops up in the deCONZ gui but does not get beyond just displaying a hex value as name. It does not show up in Phoscon.
I have tried resetting with a Hue dimmer switch several times and it does indicate resetting by blinking. Appreciate any advice.

deCONZ buster desktop image on an RPi4.
Gateway 2.25.3
Conbee 2 Firmware 26780700
~110 nodes.