Zigbee. Temperature sensor connects but does not report anything

I’ve got HA running on a HP T630 with the Sonoff Zigbee 3 dongle with the latest firmware flashed into it. I’m gradually expanding my Zigbee devices starting with some coloured bulbs from AliExpress (eWeLight) and white bulbs from Amazon (Innr). I’ve just added a basic temperature and humidity sensor (AliExpress) and that works OK. I then got a temperature and humidity sensor with its own display (AliExpress) and it connects ok but there is no battery, temperature or humidity entity created,
I’ve tried reconnecting but no change.
The Topology Visualization shows it isolated with no connection to the Controller.
So, Is this just a duff unit? Is there something I’ve missed? Do some devices only work with there own manufacturer’s kit? If so, what should I be looking for when I buy more Zigbee stuff?