Creating an AAD user through the Microsoft 365 Admin Center
As an Office 365 administrator, open https://portal.office.com/Adminportal/and you’ll have access to the Admin Center:
Note: If you can’t see the admin center icon above, try selecting ‘All apps’ and look through the list. If it’s still not there check your Microsoft 365 user permissions with an administrator.
With the Microsoft 365 admin center open we can create a new user:
Fill in the basic user information:
After selecting 
Next, assign the Business Central license to the user (and any other licenses required):
Optionally add additional user rights, then finish:
