Public/Add-SiteCollectionAdmin.ps1
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<# .DESCRIPTION Adds a specified user as a Site Collection Administrator to all SharePoint Online site collections. .Parameter AdminSiteUrl The URL of the SharePoint Online Admin Center. .Parameter UserToAdd The user principal name (UPN) of the user to add as Site Collection Administrator. .EXAMPLE Import-Module Microsoft.Online.SharePoint.PowerShell Add-SiteCollectionAdmin -AdminSiteUrl "https://contoso-admin.sharepoint.com/" -UserToAdd "johns@contoso.com" .Notes Requires the SharePoint Online Management Shell module. .Link https://github.com/TheTaylorLee/AdminToolbox #> function Add-SiteCollectionAdmin { param ( [Parameter(Mandatory)] [string]$AdminSiteUrl, [Parameter(Mandatory)] [string]$UserToAdd ) # Connect to SharePoint Online Import-Module Microsoft.Online.SharePoint.PowerShell -ErrorAction Stop # Connect to SharePoint Online Admin Center Connect-SPOService -Url $AdminSiteUrl # Get all site collections $SiteCollections = Get-SPOSite -Limit All # Add the user as a Site Collection Administrator to each site foreach ($Site in $SiteCollections) { Set-SPOUser -Site $Site.Url -LoginName $UserToAdd -IsSiteCollectionAdmin $true } } |