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I cannot find a way to get the creator of a site in a SharePoint site collection (There are more than one administrators), be it in web view or programmatically.

I tried get-author-creator-of-a-site-subsite-using-jsom-or-rest-api but seems to work only for (sub-)subsites. I also tried https://www.sharepointdiary.com/2018/02/find-who-created-site-in-sharepoint.html. I would prefer using PnP, but no solution has worked so far.

$con = Connect-PnPOnline -ReturnConnection -Url $mySiteUrl -Credentials $myCreds
$web = Get-PnPWeb -Connection $con
Get-PnPProperty -ClientObject $web -Property Author
Get-PnPProperty : 'Author' is not a member of 'Microsoft.SharePoint.Client.Web'

+ Get-PnPProperty -ClientObject $Web -Property Author
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : WriteError: (:) [Get-PnPProperty], ArgumentException
    + FullyQualifiedErrorId : EXCEPTION,SharePointPnP.PowerShell.Commands.Base.EnsureProperty

I tried including all properties $web = Get-PnPWeb -Connection $cnx -Includes allproperties without any success.

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Use Author property of the web object associated with site(remember to change the site URL for yourself):

$site = Get-SPSite your site url
$site.RootWeb.Author
$site.Dispose()

Reference:

Programatically determine who created a site collection

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  • I forgot to mention we still use SharePoint 2013 On Premise. I used Microsoft.SharePoint.Client.Runtime\v4.0_15.0.0.0__71e9bce111e9429c\Microsoft.SharePoint.Client.Runtime.dll taken from https://www.microsoft.com/en-us/download/details.aspx?id=35585 maybe not the right assemblies? I also tried with dll from PowerShell Module SharePointPnPPowerShell2013\3.25.2009.1 (Microsoft.SharePoint.Client.dll and Microsoft.SharePoint.Client.Runtime.dll) : failure instanciating SharePointOnlineCredentials.
    – jgran
    Commented Oct 22, 2020 at 10:25
  • tried with simple Credentials (not SharePointOnlineCredentials) but $Ctx.Load($Web.Author)generates an error with Load method complaining about wrong argument number + $Ctx.Load($Web.Author) + CategoryInfo : NotSpecified: (:) [], MethodException + FullyQualifiedErrorId : MethodCountCouldNotFindBest, $web.Author being null, I guess.
    – jgran
    Commented Oct 22, 2020 at 10:26
  • Indeed $Ctx.Load signature is : OverloadDefinitions: void Load[T](T clientObject, Params System.Linq.Expressions.Expression[System.Func[T,System.Object]][] retrievals).
    – jgran
    Commented Oct 22, 2020 at 10:37
  • Realizing now that solutions from https://www.sharepointdiary.com/2018/02/find-who-created-site-in-sharepoint.html were the ones I tested and link was in the question!
    – jgran
    Commented Oct 22, 2020 at 12:08
  • This powershell only works with SharePoint online, not for sharepoint server 2013, I have updated my answer, please check it.
    – Julie_MSFT
    Commented Oct 23, 2020 at 1:12

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