Are you talking about Soft-eLicenses, USB-eLicenses or Cubase 12 (new licensing system), please?
If you are talking about USB-eLicenser, the license sits on the USB-eLicenser. Just plug it USB-eLicenser to the computer and you are ready to go.
If you are talking about Soft-eLicenses, go thru the Reactivation process, please. If the Soft-eLicenser is the same as it was on the original computer (so you cannot reactivate), use the eLCC Helper to generate a new Soft-eLicenser Number, you can reactivate to.
If you are talking about Cubase 12, you get 3 seats for every license. So you should be able just to activate the new seat of your license. If all your 3 seats have been used already, get in contact with the official Steinberg support to make the seat(s) free.
PS: I wouldn’t share an email address publicly like this.