How to get my SLZB-06 to work

I’m running HA on my PC in a container. I started out with a Sonoff Zigbee USB dongle. This worked fine and I got towards 10 devices working with it.

I got a SLZB-06 now and want to use it as Zigbee controller. I’ve seen videos, where you can assign it the hardware address of the Sonoff dongle to replace it. I’m not keen of that, as I may want to re-use the Sonoff and running with the same hardware address may cause problems. I may have have to re-enroll all my devices with the SLZB, but I’ll do that.

In the meantime, I did want to test the functionality of the SLZB. I added it in HA. But I’m unable to get it to discover devices. When I go to the Sonoff device, I can click ‘Configure’ and can add new devices from there. In the same place with the SLZB the ‘Configure’ button is missing. How else can I add devices to it?