How to install your Office Home and Business 2021:

please enter here with your microsoft account (hotmail outlook…) https://redeem.microsoft.com/?wa=wsignin1.0
In order to download your office, enter the key to redeem it with your Microsoft account (link it) After linking the key with your Microsoft account, enter this link;
https://account.microsoft.com/services/?OCID=PROD_Office_CONS_MyAccount_Migration&refd=setup.office.com
then click on install download the setup install your office in good time and everything is ready ALWAYS SAVE THE MICROSOFT ACCOUNT THAT YOU HAVE USED TO DOWNLOAD OFFICE HOME AND BUSINESS 2021 SINCE IT STAYS LINKED TO THE PASSWORD ALSO SAVE THE PASSWORD THAT YOU GET IN THE PAGE
https://account.microsoft.com/services/?OCID=PROD_Office_CONS_MyAccount_Migration&refd=setup.office.com
IN CASE SOME DAY it appears that you have to ACTIVATE IT AGAIN OR WHATEVER, YOU CAN ALWAYS CHECK THAT YOUR OFFICE IS ACTIVATED BY ENTERING WORD ACCOUNT then it will show that your office is activated