Read Only Attribute

Looks like you need to use the ADSI provider...

$adObject = [adsi]"EDMS://cn=YourUserDistinguishedNameHere"
$null = $adObject.Properties["edsvaAzureObjectId"].Clear()
$null = $adObject.CommitChanges()

Thanks mate. This does work. I am not to familiar with ADSI 

I need to run that against 400+ accounts. Any idea on passing $adObject = [adsi]"EDMS://cn=YourUserDistinguishedNameHere"the info from a CSV file? 

Was thinking something like this to start just passing the CN path like this. If that worked moving it to a CSV. However running this is get 

Cannot index into a null array.

$DN = (Get-ADUser -Identity SamAccountName-Here).DistinguishedName
 
$adObject = [adsi]"EDMS://$DN"
$null = $adObject.Properties["edsvaAzureObjectId"].Clear()
$null = $adObject.CommitChanges()

** Update. actually that has worked. Closing my PS console down and opening fresh has done the trick. Now just need to try and get a CSV file working

This seems to work. 

Maybe not the greatest script but works. 

$CSVImport = "Path-To.csv"

Connect-QADService -Service "ARS-Server-FQDN" -Proxy
Import-Csv $CSVImport | ForEach-Object {

$DN = (Get-ADUser -Identity $_.SamAccountName).DistinguishedName
write-host $DN
    
    $adObject = [adsi]"EDMS://$DN"
    $null = $adObject.Properties["edsvaAzureObjectId"].Clear()
    $null = $adObject.CommitChanges()
}

Actually this has not worked. I was sure it was clearing the value

Anyone got any suggestions on how to clear this on all accounts that have the  value set? 

Actually this has not worked. I was sure it was clearing the value

Anyone got any suggestions on how to clear this on all accounts that have the  value set? 

In following with the spirit of using the ADSI provider instead of the QAD cmdlets, the following should work:

$searcher = [adsisearcher]::new()
$searcher.SearchRoot = [adsi]("EDMS://CN=Active Directory")
$searcher.SearchScope = "Subtree"
$searcher.Filter = '(&(objectClass=user)(edsvaAzureObjectId=*))'
$searcher.PageSize = 1000
$results = $searcher.FindAll()
@(
    "objectGuid",
    "distinguishedName"
).ForEach{
    $null = $searcher.PropertiesToLoad.Add($_)
}

$results.ForEach{
    $adUser = [adsi]("EDMS://<GUID=" + ([guid]$_.Properties.Item("objectGuid")[0]).Guid + ">")

    if ($null -ne $adUser.NativeGuid) {
        $null = $adUser.Properties["edsvaAzureObjectId"].Clear()
        $null = $adUser.CommitChanges()

        $null = $adUser.Dispose()
    }
}

Thank you Shawn. Really appreciate that. It did work in the end using my original method. The issue was that there was something going on with our DB since version 8.1 and i guess its one of a few reasons as to why Quest have removed 8.1 for the time being.