Instructions –
1 – Go to setup.office.com
2 – Login with your Gmail or outlook / Microsoft email id
3 – Paste the key received on E-mail
4 – click on next and download office 2021
After installation, login with the same email id on MS office
Do not use email which has active subscription of any office.
Email once binded cannot be changed.
Uninstall previous office before installing new one.