Hello   @Fbphoto 

If you can view camera's Playback when phone is on mobile network, but can not view it when in the home Wi-Fi network.

1> You could reach ISP or router support and check if there is any firewall settings and adjust router/ Modem firewall settings

2> Reboot Tapo camera

3> Confirm Tapo APP and device firmware are both up to date 

4> Make sure  1 mobile device views the Playback at the same time

If still the same, please enable Diagnose mode and help collect the camera log when you can not view playback

How to Get the Log of Tapo Camera

May I know the model of router and network topology: e.g ISP X --Router X <Wireless> Tapo camera

Can I know the MAC address of camera (please share via private message), model of phone and its OS,APP version, thanks.