Hi.
I bought 2 Schneider Wiser PowerTags and I had hoped to use them with Zigbee2Mqtt, but unfortunately they run some kind of Green Power profile which is not supported.
So if anyone else stumbles over this thread, then here is what I ended up doing:
I bought the Wiser IP Module and now I have written a small c# application for pulling data directly from the module over HTTPS and transmit it to MQTT.
You could do same thing directly with the Home Assistant HTTP sensor, but I thought this was a bit more easier and more generic.
My git repository can be found here if someone can use it for anything.