Use the PowerShell below to get the field schema (Run SharePoint Online Management Shell as administrator):
$SiteURL = "https://domain.sharepoint.com" Write-Host "Loading CSOM libraries" -foregroundcolor black -backgroundcolor yellow Add-Type -Path "c:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\ISAPI\Microsoft.SharePoint.Client.dll" Add-Type -Path "c:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\ISAPI\Microsoft.SharePoint.Client.Runtime.dll" Write-Host "Lib. successfully loaded !" -foregroundcolor black -backgroundcolor Green $scriptPath = Split-Path -Parent $MyInvocation.MyCommand.Definition $User = Read-Host -Prompt "username" $password = Read-Host -Prompt "Enter password" -AsSecureString Write-Host "Trying to reach $SiteURL // Handling ClientContext..." -foregroundcolor black -backgroundcolor yellow $Context = New-Object Microsoft.SharePoint.Client.ClientContext($SiteURL) $credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($User, $password) $Context.Credentials = $credentials $context.RequestTimeOut = 5000 * 60 * 10; $web = $context.Web $site = $context.Site $context.Load($web) $context.Load($site) try { $context.ExecuteQuery() Write-Host "Connected !" -foregroundcolor black -backgroundcolor Green } catch { Write-Host "Impossible to reach $SiteURL : bad password ?" -foregroundcolor black -backgroundcolor Red return } $list = $web.Lists.GetByTitle("Custom List"); $fields = $list.Fields; $context.Load($web) $context.Load($site) $context.Load($list) $context.Load($fields) $context.ExecuteQuery() $fields | select SchemaXML | Export-Csv -path "d:\schema.csv";`
Then follow the article Modified By Column does not get updated check the out of the box Editor field SchemaXML.
