Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
1
If your Windows licence is provided by a company you work for, you will need to contact the IT Department at your company to ask them to reactivate your licence.
2
If you are a private user, where did you get your Windows licence was that pre-installed on the PC or did you purchase a full retail Windows licence from Microsoft or from a 3rd party retailer?
Or did a PC Shop ever reinstall Windows on your PC?
3
Click your Start Button, type cmd then right click Command Prompt and choose 'Run as Administrator'
Run or paste this command and hit Enter:
slmgr.vbs /dlv
Please post a screenshot of the resulting dialog