Missing Classic Pages, and Script editor webpart missing in SharePoint Online

 

You have a modern site in SharePoint Online, but you want to get a classic page with a script editor webpart. The problem is all of this is missing! Use the PowerShell script below to enable the features required to support this. 

Remember that Communication sites do not support this, only Team sites!

Import-Module PnP.Powershell

$SiteURL = "https://contoso.sharepoint.com/sites/MYMODERNSITE"

Connect-PnPOnline $SiteURL -Interactive

$Template = Get-SPOSite -Identity $SiteURL -detailed | Select -ExpandProperty template

if($Template -eq "SITEPAGEPUBLISHING#0"){Write-Host "SharePoint Communication Sites (publishing) do not allow script editor webparts. Recreate the site as a Team site"}

else{

    Write-Host "Enabling site features to support script editor webparts"

    SharePoint Server Publishing Infrastructure of Site Collection 

    Enable-PnPFeature -Identity f6924d36-2fa8-4f0b-b16d-06b7250180fa -force -Scope site  

    #SharePoint Server Publishing of Site  

    Enable-PnPFeature -Identity 94c94ca6-b32f-4da9-a9e3-1f3d343d7ecb -force -Scope web 

    Set-SPOsite $SiteURL -DenyAddAndCustomizePages 0

    Set-PnPSite -Identity $SiteURL -NoScriptSite $false

    Set-PnPTenantSite -Identity $SiteURL -DenyAddAndCustomizePages:$false

}

Sources: 

• Team Site vs. Communication Site - Which one should I choose? | Microsoft Learn
• How to enable script editor web part in SharePoint Online Office 365 - SPGuides
• Erro while trying to activate SharePoint server publishing infrastrure feature - Microsoft Q&A
• Content Editor, Script Editor Web Part Missing in SharePoint Online? - SharePoint Diary