"The Delegates settings were not saved correctly" when you try to add a user to Exchange Server 2013 from Microsoft Outlook

To work around this issue, create a new role group which has permissions to enable and add delegates from Outlook. To do this, follow these steps:

1. Create a new child role from the parent role "User Options" by using the following statement:
   
   

   New-ManagementRole -Name "MyMailboxdelegation" -Parent "user options"

2. Include only those parameters which are required such as in the following example:
   
   

   Set-ManagementRoleEntry -Identity "MyMailboxdelegation\Set-Mailbox" -Parameters     SimpleDisplayName, RoomMailboxPassword, DisplayName, Password, OldPassword, NewPassword, AcceptMessagesOnlyFrom, AcceptMessagesOnlyFromDLMembers, AcceptMessagesOnlyFromSendersOrMembers, DeliverToMailboxAndForward, ErrorAction, ErrorVariable, ExternalOofOptions, ForwardingAddress, ForwardingSmtpAddress, Languages, MailTip, MailTipTranslations, OutBuffer, OutVariable, RejectMessagesFrom, RejectMessagesFromDLMembers, RejectMessagesFromSendersOrMembers, RequireSenderAuthenticationEnabled, UserCertificate, UserSMimeCertificate, WarningAction, WarningVariable -RemoveParameter -Confirm:$false

   Set-ManagementRoleEntry -Identity "MyMailboxdelegation\Get-Mailbox" -Parameters Database, Arbitration, RemoteArchive, Monitoring, PublicFolder -RemoveParameter -Confirm:$false

   Set-ManagementRoleEntry -Identity "MyMailboxdelegation\Set-Mailbox" -Parameters Identity –AddParameter -Confirm:$false

3. Remove all other role entries such as in the following example:
   
   

   Get-ManagementRoleEntry MyMailboxdelegation\* | ? {$_.Name -ne "set-mailbox" -and $_.Name -ne "get-mailbox"} | Remove-ManagementRoleEntry -Confirm:$false

4. Create a new role group by assigning the child role that you created in step 1 as in the following example:
   
   

   New-RoleGroup MailBoxDelegation -Roles MyMailboxdelegation

5. You are ready with the new role group MyMailboxdelegation. Next, add the user who should be able to grant Delegate + Send On Behalf rights to the role group that you created in step 4 as in the following example:
   
   

   Add-RoleGroupMember MailBoxDelegation -Member "user_alias"

   Note You can also add members from Active Directory Users and Computers snap-in, click Microsoft Exchange Security Groups.