The first step is to create the Azure Active Directory tenant.
1. Sign in to the Azure portal.
2. From the Azure portal menu, select Azure Active Directory.
3. On the overview page, select Manage tenants.
4. Select +Create.
5. On the Basics tab, select Azure Active Directory.
6. Select Next: Configuration to move on to the Configuration tab.
7. For Organization name, enter 12345678.
8. For the Initial domain name, enter 12345678.
9. Leave the Country/Region as the default.
The next step is to create the user.
1. From the Azure portal menu, select Azure Active Directory.
2. Select Users then select New user.
3. Enter User1 in the User name and Name fields.
4. Leave the default option of Auto-generate password.
5. Click the Create button.
Reference:
https://docs.microsoft.com/en-us/azure/active-directory/fundamentals/active-directory-access-create-new-tenant
https://docs.microsoft.com/en-us/azure/active-directory/fundamentals/add-users-azure-active-directory
