Zigbee - Sonoff SNZB - 02 - Discovery cannot be completed - Error: "Node has not completed discovery"

I had a similar problem, see [OH3.1.0 M1] Zigbee Device not recognized - Worked with 3.0.1

I gave up, bought a conbee II/ deconz zigbee stick: ConBee II Übersicht and everything worked smooth.

regards