Assigning Azure Active Directory Roles
Procedure
- On the Azure AD portal at https://portal.azure.com/, under Manage Azure Active Directory, select View.
- On the Overview page, under Manage, select Roles and administrators.
- 
                Select Exchange Administrator roles by selecting the
                    role's name (not the checkbox) in the results. 
                 
- 
                On the Assignments page, select Add
                        assignments.
                 
- 
                On the Add assignments panel, select the app that you
                    created.
                 
- 
                Select Add. On the Assignments
                    page, verify that the app has been assigned to the role.
                