Hi Max, in order to have the group listed on the Dashboard, the group first needs to be granted access to the Workspace. This can be done from the Domain’s homepage, in the
Users & Groups tab.
From there, you can select the desired Group and give it rights to the workspace where the dashboards are located. Then, you can share the dashboard with them. You can find more info about the different types of rights in the article
Manage Workspace Permissions.