For myenergi devices to talk to the server they need to know the IP address to connect to.  This should be set automatically but it can be checked on the menus on the zappi.

On the most recent zappi firmware:

Navigate to the Advanced -> System menu

Make a note of the Cloud: IP Address

On older zappi firmware

Navigate to the Advanced -> Linked Devices menu

On the Linked Devices menu, select Devices

Then select Hub

Make a note of the Cloud: IP Address