Kickr connected but not picking up watts

The trainer was being recognised via bluetooth through the WAHOO fitness app and zwift. It was also being recognised via the ant+ on zwift. Initially the watts were registering on zwift and then for some reason the watts dropped. Although the trainer is connecting via bluetooth, it is not registering any watts. I have disconnected the trainer from the mains and waited for a period of time before restarting. I have rebooted zwift and my mobile, however, the trainer, although recognised via bluetooth (not being pick up by ant+), it will still not register watts on zwift or via the wahoo app. When I go into try a factory spin down, the image shows a red circle icon. Not sure if this is related.

Any thoughts on what the issue is with the trainer not picking up watts? Thanks Eddie