@Nikriba 

Hi,
You can refer to the instructions below to adjust the camera settings and position to improve the camera's performance.
Detection Is Not Working On TP-Link Camera
Detection Range Test: test the activity detection zone of the Tapo Battery Camera
 

From your description, it seems the camera can't be woken up by the motion that is 8-9 meters away, while the Tapo T100 motion sensor can't be used to wake up the camera. If the problem remains after adjusting the camera settings and position:
1. Send me the pictures of the camera's Device Settings > Detection page, Wake-up Sensitivity page, and the enabled detection types pages.

2. Can you share a video showing the motion that can't be detected by the camera when it's sleeping?

Best Regards

  @Nikriba 

Hi,
You can upload the video to your cloud server(such as Google Drive), generate a link to download it, and then send me(@Solla-topee) the video via a private message.
If you do not subscribe to the cloud service, please let me know, and I'll inform our tech team to contact you via email.
Best Regards

  @Nikriba 

Hi,
Thank you very much for the video provided. The video shows that the Tapo C425's detection feature works normally, the camera can't detect you in the first location(near the door) because it's not woken up by your motion, this is related to your camera's installation position and angle, it's suggested to tilt up your camera's lens(the current angle between the camera and the ceiling may be around 30°, it is recommended to adjust it to around 15°), and then check if the motion near the door will wake up the camera.

You can use the Detection Range Test feature on the Tapo C425 to help you find the suitable detection range.
Detection Range Test: test the activity detection zone of the Tapo Battery Camera

Best Regards