You are unable to use Wireless Keyboard in Windows virtual machine.
Keyboard driver may be installed incorrectly.
- Log in to Windows Virtual Machine using Administrator account.
- Go to Start > Right click on Computer > click on Manage.
Check if there are any yellow signs on Keyboard device.
Reinstall Keyboard driver in case you can see any sights in Device Manager.
On the Mac side: Checked the configuration under System Preferences. System Preferences > Security & Privacy > Privacy Tab > Acessibility.
Add Parallels Desktop in the list.
NOTE: In case none of the solutions above worked for you, try to reinstall Parallels Tools using the instructions in KB Cannot install Parallels Tools 8969.