When you try enable archiving on any mailbox hosted on Office 365 (withing hybrid deployment with exchange 2010) , you face the below error

“The following error occurred during validation in agent ‘Windows LiveId Agent’: ‘Unable to perform the save operation. ‘Fayis Khader’ is not within a valid server write scope.”

This problem occurs because recipient management must be performed from the on-premises environment when you’re using Active Directory synchronization.

To resolve this issue, enable archiving for the mailbox from the on-premises Exchange server. To do this, use one of the following methods.

Method 1: Use the Exchange Admin Center or the Exchange Management Console

In Exchange 2013

1. Open the Exchange Admin Center.
2. Click recipients, and then click mailboxes,
3. Click the mailbox that you want to change, click Enable under In-Place Archive, and then click yes.
4. Wait for two cycles of directory synchronization to run (about six hours). to force directory synchronization follow this article Force directory synchronization

In Exchange 2010

1. Open the Exchange Management Console.
2. In the console tree, expand Recipient Configuration, and then click Mail Contact.
3. Right-click the contact that you want to change, and then click Enable Hosted Archive.
4. Wait for two cycles of directory synchronization to run (about six hours).to force directory synchronization follow this article Force directory synchronization

Method 2: Use the Exchange Management Shell

1. Open the Exchange Management Shell, and then run the following cmdlet:

   Enable-RemoteMailbox <UserName> -Archive

2. Wait for two cycles of directory synchronization to run (about six hours). to force directory synchronization follow this article Force directory synchronization