Upgrading MacBook - Active License

When moving to a new MacBook, Parallels Toolbox is installed during the migration process. When the computer boots, it opens and prompts me to buy a new subscription. But I can see the active subscription listed when I log in. Logging in to the Parallels website, I can see that only one of my two licenses is active.
I tried uninstalling the application and reinstalling it, but the result is the same.

How may I activate the license on this new installation? I can't find the license key anywhere on receipts or on the Parallels website. Unlike Parallels Desktop, I am not prompted to make the license active on this machine.