Office 365 Global admins and Dynamics 365 Service admins can administer without a license
By default, all Office 365 Global administrators and Dynamics 365 Service administrators who do not have a Dynamics 365 for Customer Engagement apps license are granted the following two levels of permission in Customer Engagement apps.
System administrator security role
Administrative access mode
The System administrator security role is typically granted to Dynamics 365 for Customer Engagement administrators giving them unrestricted access to the administrative (Settings) areas, which are used for managing and configuring features of Dynamics 365 for Customer Engagement apps.
Administrative access mode limits access to those areas of Dynamics 365 for Customer Engagement apps used to configure or customize the system.
To give these administrators access to additional areas, such as the Sales, Marketing, and Service areas, a Customer Engagement apps license must be added to the Office 365 Global administrator or Dynamics 365 Service administrator user account, by using the Microsoft 365 admin center. Note that Administrative access mode cannot be changed on the user form in the Customer Engagement application.
Create a Dynamics 365 for Customer Engagement Service administrator account
Sign in to the Microsoft 365 admin center, and then choose Users > Active Users.
Next to Product licenses, click Edit.
Make sure a Dynamics 365 for Customer Engagement apps license is not assigned to this user, and then click Save.
Unlicensed Office 365 Global and Dynamics 365 Service administrators have access to the administrative areas of Customer Engagement apps. However, if the administrator also needs access to additional areas of Customer Engagement apps you must select a Customer Engagement apps license for the user.
Next to Roles, click Edit and then click either Global administrator or Customized administrator > Dynamics 365 service administrator. For more information about these roles, see Assigning admin roles.
Enter an alternate email address, and then click Save.