Apply Sensitivity label to all Site collections in SharePoint admin center

With E3 license, we have to label everything manually, which is very time-consuming when we deal with many site collections.

For our project, I used a PowerShell Script to automate the process of applying Sensitivity labels to all Site Collections.

#Run the Get-Label command to retrieve the list of available labels:

Connect-IPPSSession -UserPrincipalName spadmin@gurram.onmicrosoft.com

Get-Label |ft Name, Guid, ContentType

#Copy the required label GUID

Disconnect-IPPSSession

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#Connect to PnP PowerShell

Connect-PnPOnline -Url "https://gurram-admin.sharepoint.com" -Interactive

#Get All Site collections - Include Only: Team site (no M365 Group), Team site (classic experience), Project Web App site and Team sites

$Sites = Get-PnPTenantSite | Where-Object { $_.Template -eq "STS#3" -or $_.Template -eq "STS#0" -or $_.Template -eq "PWA#0" -or $_.Template -eq "GROUP#0" }

#For each site in the Site collections

ForEach ($site in $Sites) {

    #Required Label GUID from the above Script

    $LabelId = "abc123de-45f6-7g89-hi12-34j56789jk12"  

    $ctn = Connect-PnPOnline -Url $site.URL -Interactive

    $label = Get-PnPSiteSensitivityLabel -Connection $ctn

   if ($label.DisplayName -eq "") {

   #Add sensitivity Label to site

   Set-PnPTenantSite -Identity $site.URL -SensitivityLabel $LabelId

  } else {

    Write-Host $site.URL,"Not Blank"

  }

   $Object = [PSCustomObject]@{

    URL = $site.URL

    Sensitivitylabel= $label.DisplayName

    }

    $List += $Object

    #Write-Host $site.URL

    }

#Disconnect

Disconnect-PnPOnline