You require a Spinpanel role to be able to manage groups.
You can create groups in Spinpanel, these groups are only available for Spinpanel use. A User group can be used for role management, you can create Spinpanel roles and assign them to a User group. For example, if you create a Spinpanel role for your “Finance” team to only be able to view reports you can create a User group and assign it to that role. Then from the Users page you can easily manage membership to that Spinpanel role group.
A Device group is used for WorkSpace. You can create machine policies and assign them to device group. In a Device group you can add any device enrolled in the organizations WorkSpace solution.