Sign-Up / Sign-In Error || MAC address is missing. Please enter the mac address

Error : MAC address is missing. Please enter the mac address.

Cause :
This issue occur when 'systeminfo' command is not working on the system.

Solution :
Go to Services > Check Windows Management Instrumentation is Running or Not.
If Not Running >> Please set Start up Type is - 'Automatic' and set Status is - 'Running'.
Once it is done.
- Open Command prompt (Run as Administrator).
- Type the following command there - net stop winmgmt
- Moreover, if it is asking Do you want to continue this operation? (Y/N) [N] : >>> Here enter -- 'Y' and enter.
- Now enter the command - winmgmt /resetrepository and enter.
- Now run systeminfo command and then check.
Hope this Helps.