An ezeep Blue account created Blue through Microsoft's Azure Marketplace is connected to the Azure Active Directory (AAD) that is part of the Azure subscription you have used to sign up for ezeep Blue.
All your users and groups from the Azure Active Directory are automatically available for use with your ezeep Blue account through this connection and can be used to assign printers.
To add or remove groups and add or remove users, please use Microsoft's management tools for your Microsoft Azure account.
You can add users and groups using ezeep Blue's built-in user and group management. Still, we recommend sticking to Azure Active Directory for consistency and simplicity unless you have a specific use case that requires the user of the built-in users and groups.