@Italy 

Hi,  
Please refer to the following instructions to troubleshoot if you can't receive detection notifications.
What to do if I can't receive notifications with the Tapo Cam or have a delayed notification
 

Please confirm the following information if the same phenomenon persists.
  1. What's the model number of your camera?
  2. Please enable the Alarm feature on the Tapo camera, and then check if the camera alarms when an event occurs in front of the camera. 
      How to configure the Alarm feature for Tapo Cameras on the Tapo app 

Best Regards