Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Which specific version of Microsoft Office is this? I am not sure that you can install Office for two users on one and the same machine, if that is what you are trying to do.
Typically, if you want to share a subscription with a family member, you need a Microsoft 365 Family (or Premium) subscription and you invite your family member to share it, so that they can install on their devices. See https://support.microsoft.com/en-us/accounts-billing/subscriptions/share-your-microsoft-365-subscription .