Hi @Philippe Guillon ,
Thanks for your post! You are correct that Azure AD Connect in itself just for basic synchronization is free, but more advanced features such as cross-tenant user synchronization and global password protection and management require at least a Premium P1 license. The official pricing page breaks down these features in more detail.
Synchronization of users/groups from on-premises to Azure AD works even with free version and without Premium licenses but other premium features such as Group assignment to applications, group provisioning to SaaS apps, password writeback, Self-service group management, and seamless access to on-premises and cloud capabilities would require an Azure AD Premium license.
These licenses are always licensed per user. For an example, if you have 15 accounts then you need to buy 15 licenses for your tenant.
Let me know if this helps. You can also chat with the Sales/Subscription team for free if you are looking for clarity around any of the pricing or licensing for specific features. https://azure.microsoft.com/en-us/contact/
-
If the information helped you, please Accept the answer. This will help us as well as others in the community who might be researching the same question.