Related question: Is "AllowUnsafeUpdates" available in SharePoint Online?

Since AllowUnsafeUpdates is not available via CSOM, i am trying to update this info in some manner.

I try this but no success

$adminUrl = "https://cutomer-admin.sharepoint.com"
$userName = "[email protected]"
$SPOSite ="https://customer.sharepoint.com/sites/SPSite1/"
$DefaultEmailAddress = "[email protected]"

Add-Type -Path "C:\Program Files\SharePoint Online Management Shell\Microsoft.Online.SharePoint.PowerShell\Microsoft.SharePoint.Client.dll"
Add-Type -Path "C:\Program Files\SharePoint Online Management Shell\Microsoft.Online.SharePoint.PowerShell\Microsoft.SharePoint.Client.Runtime.dll"
Add-Type -Path "C:\Program Files\SharePoint Online Management Shell\Microsoft.Online.SharePoint.PowerShell\Microsoft.Online.SharePoint.Client.Tenant.dll"

$creds = Get-Credential -Credential $userName
$credentials = New-Object -TypeName System.Management.Automation.PSCredential -argumentlist $creds
$SPOCredentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials -ArgumentList ($creds.Username, $creds.Password)

$Ctx = New-Object Microsoft.SharePoint.Client.ClientContext($SPOSite)
$Ctx.Credentials = $SPOcredentials
$Web = $Ctx.Web
$SPODefaultEmailAddress = $web.EnsureUser($DefaultEmailAddress)
$Web.Author = $SPODefaultEmailAddress
$Web["Author"] = $SPODefaultEmailAddress

Does anyone know if this is possible?

1 Answer 1


In the above code, you are updating the SharePoint online web property,and here I think after web object client context load and executequery is missing.

You can little modify your code :

$Web = $Ctx.Web

$clientContext.Load(Web) $clientContext.ExecuteQuery()

  $SPODefaultEmailAddress = $web.EnsureUser($DefaultEmailAddress) $Ctx.ExecuteQuery()

  $Web.Author = $SPODefaultEmailAddress


I think we can do this one using PnP PowerShell command as well.

You can try the below command :

  Connect-PnPOnline -Url https://ktskumar.sharepoint.com/mywork -Credentials (Get-Credential)
Set-PnPWeb -Title "My Work"

Note - in the above web title is being updated, you can change it to author.


Update :

  • Set-PnPWeb does not have author property.

  • In SharePoint server side dll, author property has both get and set but client side dll has only get property. So, we cannot change this property value in SharePoint online.


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