Disabling uart and still using external USB BT stick

I’ve had some TRADFRI lamps for a while now, and I wanted to add three more. I just can’t get it to work properly :confused:

HA keeps throwing this at me:

2019-03-25 20:08:13 ERROR (MainThread) [zigpy.device] Failed ZDO request during device 
initialization: Message send failure: EmberStatus.DELIVERY_FAILED
Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/zigpy/device.py", line 52, in _initialize
    epr = await self.zdo.request(0x0005, self.nwk, tries=3, delay=2)
File "/usr/local/lib/python3.7/site-packages/zigpy/util.py", line 52, in retry
    r = await func()
  File "/usr/local/lib/python3.7/site-packages/zigpy/device.py", line 90, in request
    expect_reply=expect_reply,
  File "/usr/local/lib/python3.7/site-packages/bellows/zigbee/application.py", line 262, in request
    v = await send_fut
zigpy.exceptions.DeliveryError: Message send failure: EmberStatus.DELIVERY_FAILED

I’m using an Elelabs Zigbee hat for Pi (3)

I have no clue what to do to get my new lamps paired…