$Listitem["MyLookupField"] = new-object Microsoft.SharePoint.SPFieldLookupValue(1,"1") $Listitem.systemupdate()
PowerShell Update SharePoint Lookup Field
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SharePointed
SharePoint and Power Platform and Stuff
$Listitem["MyLookupField"] = new-object Microsoft.SharePoint.SPFieldLookupValue(1,"1") $Listitem.systemupdate()