Activation Problem

I put in my activation key for trial version. but eLicencer control Center showed msg as "there are no elicences on your computer.( My USB was connected to computer)
What should I do ?
I have not getting the software cubase 10.5 due to this ERROR showing up.

Hi and welcome,

Do you have Cubase Pro or Cubase Elements Trial license, please?

For Cubase Pro you need a USB-eLicenser. Cubase Elements, you can use with a Soft-eLicenser. In this case make sure a Soft-eLicenser Number has been created in the eLCC application, please.