Miscellaneous topics that do not fit into specific categories.
Hello
What kind of Microsoft 365 are you using? If you are using Microsoft 365 personal, you cannot add a new user with their own email address. If you are on Microsoft 365 family, you can share with family members who are on their own Microsoft accounts, up to 5 besides yourself.
If you are on Microsoft 365 business tier license, adding a new person requires their own license, you cannot cover them using your license. You add them in Admin Center if you have admin access https://admin.microsoft.com > Users, from here you can create a new user, and then you can assign them a license. If you don't have a license, you can buy it from Billing >Purchase services.