Follow the steps below for add user to Business Central
1, Go to Admin Center
(Note: you can access Admin Center by select the link in Settings page)
2, In Admin Center, select the apps for System Management (系統管理)
3, Select Active users in action panel
4, Click Add a User action button and then add the user
5. In the user detail page, select Licenses and apps tab and then select the appropriated licenses to the user.
Note: Select Dynamics 365 Business Central External Accountant for the user who need to access to the system for preview data only (for example, Access by Auditor for auditing activity)