/// <summary>
        /// Verifies that the Azure Active Directory user or group exists, and will get the object id if it is not set.
        /// </summary>
        /// <param name="displayName">Azure Active Directory user or group display name</param>
        /// <param name="objectId">Azure Active Directory user or group object id</param>
        /// <returns></returns>
        protected ServerAdministratorCreateOrUpdateProperties GetActiveDirectoryInformation(string displayName, Guid objectId)
        {
            // Gets the default Tenant id for the subscriptions
            Guid tenantId = GetTenantId();

            // Check for a Azure Active Directory group. Recommended to always use group.
            IEnumerable <MicrosoftAzureCommandsResourcesModelsActiveDirectory.PSADGroup> groupList = null;

            var filter = new MicrosoftAzureCommandsResourcesModelsActiveDirectory.ADObjectFilterOptions()
            {
                Id           = (objectId != null && objectId != Guid.Empty) ? objectId.ToString() : null,
                SearchString = displayName,
                Paging       = true,
            };

            // Get a list of groups from Azure Active Directory
            groupList = ActiveDirectoryClient.FilterGroups(filter).Where(gr => string.Equals(gr.DisplayName, displayName, StringComparison.OrdinalIgnoreCase));

            if (groupList.Count() > 1)
            {
                // More than one group was found with that display name.
                throw new ArgumentException(string.Format(Resources.ADGroupMoreThanOneFound, displayName));
            }
            else if (groupList.Count() == 1)
            {
                // Only one group was found. Get the group display name and object id
                var group = groupList.First();

                // Only support Security Groups
                if (group.SecurityEnabled.HasValue && !group.SecurityEnabled.Value)
                {
                    throw new ArgumentException(string.Format(Resources.InvalidADGroupNotSecurity, displayName));
                }

                return(new ServerAdministratorCreateOrUpdateProperties()
                {
                    Login = group.DisplayName,
                    Sid = group.Id,
                    TenantId = tenantId,
                });
            }

            // No group was found. Check for a user
            filter = new MicrosoftAzureCommandsResourcesModelsActiveDirectory.ADObjectFilterOptions()
            {
                Id           = (objectId != null && objectId != Guid.Empty) ? objectId.ToString() : null,
                SearchString = displayName,
                Paging       = true,
            };

            // Get a list of user from Azure Active Directory
            var userList = ActiveDirectoryClient.FilterUsers(filter).Where(gr => string.Equals(gr.DisplayName, displayName, StringComparison.OrdinalIgnoreCase));

            // No user was found. Check if the display name is a UPN
            if (userList == null || userList.Count() == 0)
            {
                // Check if the display name is the UPN
                filter = new MicrosoftAzureCommandsResourcesModelsActiveDirectory.ADObjectFilterOptions()
                {
                    Id     = (objectId != null && objectId != Guid.Empty) ? objectId.ToString() : null,
                    UPN    = displayName,
                    Paging = true,
                };

                userList = ActiveDirectoryClient.FilterUsers(filter).Where(gr => string.Equals(gr.UserPrincipalName, displayName, StringComparison.OrdinalIgnoreCase));
            }

            // No user was found
            if (userList == null || userList.Count() == 0)
            {
                throw new ArgumentException(string.Format(Resources.ADObjectNotFound, displayName));
            }
            else if (userList.Count() > 1)
            {
                // More than one user was found.
                throw new ArgumentException(string.Format(Resources.ADUserMoreThanOneFound, displayName));
            }
            else
            {
                // Only one user was found. Get the user display name and object id
                var obj = userList.First();

                return(new ServerAdministratorCreateOrUpdateProperties()
                {
                    Login = displayName,
                    Sid = obj.Id,
                    TenantId = tenantId,
                });
            }
        }
        /// <summary>
        /// Verifies that the Azure Active Directory user or group exists, and will get the object id if it is not set.
        /// </summary>
        /// <param name="displayName">Azure Active Directory user or group display name</param>
        /// <param name="objectId">Azure Active Directory user or group object id</param>
        /// <returns></returns>
        protected ServerAdministratorCreateOrUpdateProperties GetActiveDirectoryInformation(string displayName, Guid objectId)
        {
            // Gets the default Tenant id for the subscriptions
            Guid tenantId = GetTenantId();

            // Check for a Azure Active Directory group. Recommended to always use group.
            IEnumerable<MicrosoftAzureCommandsResourcesModelsActiveDirectory.PSADGroup> groupList = null;

            var filter = new MicrosoftAzureCommandsResourcesModelsActiveDirectory.ADObjectFilterOptions()
            {
                Id = (objectId != null && objectId != Guid.Empty) ? objectId.ToString() : null,
                SearchString = displayName,
                Paging = true,
            };

            // Get a list of groups from Azure Active Directory
            groupList = ActiveDirectoryClient.FilterGroups(filter).Where(gr => string.Equals(gr.DisplayName, displayName, StringComparison.OrdinalIgnoreCase));

            if (groupList.Count() > 1)
            {
                // More than one group was found with that display name.
                throw new ArgumentException(string.Format(Resources.ADGroupMoreThanOneFound, displayName));
            }
            else if (groupList.Count() == 1)
            {
                // Only one group was found. Get the group display name and object id
                var group = groupList.First();
                
                // Only support Security Groups
                if (group.SecurityEnabled.HasValue && !group.SecurityEnabled.Value)
                {
                    throw new ArgumentException(string.Format(Resources.InvalidADGroupNotSecurity, displayName));
                }

                return new ServerAdministratorCreateOrUpdateProperties()
                {
                    Login = group.DisplayName,
                    Sid = group.Id,
                    TenantId = tenantId,
                };
            }

            // No group was found. Check for a user
            filter = new MicrosoftAzureCommandsResourcesModelsActiveDirectory.ADObjectFilterOptions()
            {
                Id = (objectId != null && objectId != Guid.Empty) ? objectId.ToString() : null,
                SearchString = displayName,
                Paging = true,
            };

            // Get a list of user from Azure Active Directory
            var userList = ActiveDirectoryClient.FilterUsers(filter).Where(gr => string.Equals(gr.DisplayName, displayName, StringComparison.OrdinalIgnoreCase));

            // No user was found. Check if the display name is a UPN
            if (userList == null || userList.Count() == 0)
            {
                // Check if the display name is the UPN
                filter = new MicrosoftAzureCommandsResourcesModelsActiveDirectory.ADObjectFilterOptions()
                {
                    Id = (objectId != null && objectId != Guid.Empty) ? objectId.ToString() : null,
                    UPN = displayName,
                    Paging = true,
                };

                userList = ActiveDirectoryClient.FilterUsers(filter).Where(gr => string.Equals(gr.UserPrincipalName, displayName, StringComparison.OrdinalIgnoreCase));
            }

            // No user was found
            if (userList == null || userList.Count() == 0)
            {
                throw new ArgumentException(string.Format(Resources.ADObjectNotFound, displayName));
            }
            else if (userList.Count() > 1)
            {
                // More than one user was found.
                throw new ArgumentException(string.Format(Resources.ADUserMoreThanOneFound, displayName));
            }
            else
            {
                // Only one user was found. Get the user display name and object id
                var obj = userList.First();

                return new ServerAdministratorCreateOrUpdateProperties()
                {
                    Login = displayName,
                    Sid = obj.Id,
                    TenantId = tenantId,
                };
            }
        }