Associated query:
Is "AllowUnsafeUpdates" obtainable in SharePoint On-line?

Since AllowUnsafeUpdates is just not obtainable through CSOM, i’m attempting to replace this data in some method.

I do this however no success

$adminUrl = "https://cutomer-admin.sharepoint.com"
$userName = "person@buyer.com"
$SPOSite ="https://buyer.sharepoint.com/websites/SPSite1/"
$DefaultEmailAddress = "AdmAccount@buyer.com"

Add-Sort -Path "C:Program FilesSharePoint On-line Administration ShellMicrosoft.On-line.SharePoint.PowerShellMicrosoft.SharePoint.Consumer.dll"
Add-Sort -Path "C:Program FilesSharePoint On-line Administration ShellMicrosoft.On-line.SharePoint.PowerShellMicrosoft.SharePoint.Consumer.Runtime.dll"
Add-Sort -Path "C:Program FilesSharePoint On-line Administration ShellMicrosoft.On-line.SharePoint.PowerShellMicrosoft.On-line.SharePoint.Consumer.Tenant.dll"

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

$Ctx = New-Object Microsoft.SharePoint.Consumer.ClientContext($SPOSite)
$Ctx.Credentials = $SPOcredentials
$Internet = $Ctx.Internet
$SPODefaultEmailAddress = $internet.EnsureUser($DefaultEmailAddress)
$Ctx.ExecuteQuery()
$Internet.Writer = $SPODefaultEmailAddress
$Internet["Author"] = $SPODefaultEmailAddress
$Internet.Replace()
$Ctx.ExecuteQuery()

Does anybody know if that is attainable?