@ZaiBii 

Hi,
You can refer to the instructions below to troubleshoot the reported case.
What should I do if I can't view the Tapo&Kasa camera?
 

Here are more detailed information I want to confirm:
1. The test results of the above steps.
2. The Wi-Fi signal strength value on the camera's Device Settings>Device Info page, you can tap the Wi-Fi icon to see the RSSI value.
3. Your network diagram, is your camera connected to the router's Wi-Fi directly?

Best Regards