ImmutableID to Extensionattribute

Hello Charles, 

There are two different queries in your request. 

First - How to writeback Immutable ID to an Extension Attribute. 

Second - ObjectID of cloud Accounts. 

In Order to complete the first task,

Create and Outbound rule for AD connector that must map source anchor to extension attribute, below mentioned is an example,

Add-ADSyncAttributeFlowMapping  `

-SynchronizationRule $syncRule[0] `

-Source @('sourceAnchor') `

-Destination 'msDS-cloudExtensionAttribute10' `

-FlowType 'Direct' `

-ValueMergeType 'Update' `

-OutVariable syncRule

Once the rule is created run a sync and you will find the extension attribute populated with source anchor.

For the second query, ObjectID is an attribute that belongs to Object Class and is a mandate attribute that will be populated for all the objects. (Synced or Cloud)

To check about the Object class you can run the below mentioned command on AzureAD powershell.

Get-AzureADUser | Get-Member

Let me know if you have any query.

Regards,

Rishabh