Read extension attribute value for Ad Azure user object using PowerShell

Hi Guys,

I need help to read extentionAttribute value for user object in AD Azure cloud using PowerShell.

I tried below command:

$extAttrib = (Get-MsolUser -UserPrincipalName "abc123@xyz.com" | Select-Object -Property *).ExtensionData

$extAttrib is showing as System.Runtime.Serialization.ExtensionDataObject type.

How will I fetch extentionAttribute values from $extAttrib variable?

Or Do you have any other method to fetch extenstionAttribute values using PowerShell command.

Thanks!!

Sujit