To obtain a working activation key for Parallels Desktop 18 for Mac , you must purchase a license directly from the Official Parallels Store or an authorized reseller like Apple App Store How to Activate Your License
If you have already installed the application, follow these steps to activate it: Problems with Activation of Desktop 18 - Parallels Forums activation key for parallels desktop 18 for mac work
Ensure the key is entered exactly as shown, including any dashes. To obtain a working activation key for Parallels