If you've activated your Maproom license, it's connected to the PC you're working on. When you want to use your Maproom license on a different computer, you first have to delete the license activation. Then, you can reactivate on a different machine. Don't worry, deleting your activation sounds serious. But it's just telling the license server to forget that you've activated your license. You're not deleting the actual license itself.
You can delete the activation yourself in the license portal. Open the portal https://klaasnienhuis.cryptlex.app/ and log in with the username you've used to purchase the license. It's likely you don't have set up a password yet, just click on "reset password" to make a new one.
After logging into the portal, you will see your Maproom license. Click on the link in the column "Activations". Then click on the hostname. That's the name of the computer the license is activated on. Finally, click on the menu icon in the top right and press "Delete".
Now you can open Maproom on another PC and activate your license.
Click on the activation link
Click on the host name
Delete the activation