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For adding a person to the group “Licence Manager” you have to navigate to the tab “Enterprise applications“ inside of the Azure Active Directory. Search now in the tab “All applications” for the app “Link Spotter”.
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After selecting the app, you see all users, which have a specific applications assignement under the tab “Users and groups“. With the button “Add user/group“ you have the possibility to assign users the group “Licence Manager”.