You should be able to also use Microsoft 365 Groups for scoping, including those with dynamic membership. Have you tried that?
Creating a dynamic group for Purview policies to apply to E3/E5 users
I am working on configuring a Purview Exchange policy to encrypt data shared outside our organization. I want to include users through a dynamic security group specifically for E3 and E5 licensed users. The challenge is that the group needs to automatically update as user licenses change, but currently, Purview only supports mail-enabled groups or distribution groups for policy application.
Unfortunately, converting this dynamic security group into a mail-enabled group is not feasible in our setup. Could you advise on any potential workarounds for this limitation? How do other organizations manage to apply Purview policies to all new users with assigned licenses without manually adding them to a distribution group every time a license is assigned?
Additionally, if I were to apply the policy broadly to all users, are there any implications for those who do not have the necessary licenses? I'm concerned about the impact this might have on users who aren't covered under the appropriate licensing terms.
Thank you for any insights or advice you can provide.