Can't link EE TV App to EE TV Box

[MeMongo]

I just had to replace my BT TV box and received an EE TV Box in it's place. Now I cannot link the EE TV App to the new box. Before you ask: 

- Mobile and Box are on same WiFi network

- I unregistered and re-registered mobile on the app

The app just won't find the box. 

Any guidance appreciated

[DarrenDev]

Have you tried rebooting everything - TV Box, Smart Hub, as well as any powerline adapters if you're using them?

[MeMongo]

Rebooting worked - thanks!