The most common reason this happens is when the phone and TV are using different WiFi connections.

They must use the same WiFi Connection for the system to work.

Set up EShare on the TV

Open the Eshare App

Scan the code on the Eshare App by allowing the camera on the phone to do this

Install the Eshare App on your phone

Once the App is installed open it

When the Yellow Red Blue indicators flash open scan - Then Scan the QR code on the TV screen 

Once done you are connected.

If you have an error such as invalid QC Code - this means you are not on the same WiFi connection.