6nct3-8hgpg-vy8h7-843w6-683gt- ✓

The text provided, 6NCT3-8HGPG-VY8H7-843w6-683GT , appears to be a Windows generic (default) product key

If you need to manually input a key, you can open Command Prompt as an Administrator and use the command slmgr.vbs -ipk . 6nct3-8hgpg-vy8h7-843w6-683gt-