They need your serial number yes.When you buy you need to send the serial number of the receiver, (Menu - Settings - About STB) & leave it switched on, then follow the sellers instructions.
Crazy you can not mention server names but can link to a seller 🤔What box do you have & is it new.
The "Starsat 2000HD Extreme T13" is f*****r server
Edit your post - you can't mention server names here.
if the box is new it should have 15 months server.