Sorry to hear that you are having trouble activating Windows 11 Pro. Could you please confirm the following?
- Was the Windows 11 Pro license purchased from the Microsoft Store from inside this exact Parallels virtual machine, or was it purchased before this VM was created?
- After purchasing Windows, was the Parallels VM recreated, cloned, restored from a backup, or was its hardware configuration changed?
- Under Settings > System > Activation, does it show Windows 11 Pro as the installed edition?
- Are you currently signed into Windows with the same Microsoft account that was used for the Microsoft Store purchase?