@RichardMarshall 

Hi,
You can refer to the following steps to troubleshoot.

1. Change your router's Wi-Fi name, password, and security type to the same as before, once the changes take effect, reboot your camera and check if it will work.
If so, but you want to use the new Wi-Fi name and password, please reset the camera first or remove it from the Tapo app when it's online, change the router's Wi-Fi settings, and then reconfigure the camera.

2. If you do not want to change the Wi-Fi settings on your router, you can try to connect the camera to the router by an ethernet cable and check if it will work.
If so, reset the camera and reconfigure it to connect to the router's Wi-Fi.

Best Regards