If you want to change the services assigned to a user, you will need to modify the licences assigned to that user. You can change a user’s licence through the Microsoft 365 Admin Center.
If you need additional licences, you will need to purchase them in CORE.
Modify a User’s Licence
Log into the Microsoft 365 Admin Center using global admin credentials for the tenant: https://admin.microsoft.com
Go to ‘Users > Active Users’ on the left-hand menu
Click onto the User you want to update the licences for
Select the Licenses and Apps heading
Tick the checkbox next to the required licences for the user
If you want to disable any services for that user (i.e. disable the email service for the user), expand Apps and untick any services you do not want the user to have
Press Save Changes
New services can take a short while to appear for the user.