Thanks for the PTZ settings, I was using wrong ONVIF port number
With regards to your 2-way audio issue, I have 2-way audio working with Tapo C220 camera. Under your go2rtc settings add the following:
streams:
EundE_EINGANG-Innen:
- rtsp://USER:[email protected]:554/stream1
- tapo://[email protected]
( # insert your tplink cloud password without username)
Hopefully that will enable 2-way audio for you too