Currently, the default behavior in Dynamics 365 Online is to assign security roles on a per-user basis.

While it is possible to assign the same security role to multiple users at once, customers prefer to assign it per security group in the Microsoft 365 Management Center.

This feature will make the management of users in Dynamics 365 Online more efficient, as it will be possible to manage what security roles are assigned to which security groups and who the target users are at one time.