The activation key you will enter in the next step will be registered under the account you signed in to. If you would like to change the account you are signed in to, click on the Parallels Desktop menu and select Account & License. In the new window, click on the account email address and choose Sign Out.
When Parallels Desktop prompts you to sign in, sign in to the account which contains your activation keys. After signing in, you will see the list of your license keys. Double-click on the license you would like to use for activation. 2b1af7f3a8