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M365 Changelog: (Updated) Remove Custom Script setting in OneDrive and SharePoint web

Summary

The Custom Script setting will be removed from OneDrive and SharePoint sites by early-May 2024. A new PowerShell command, DelayDenyAddAndCustomizePagesEnforcement, will allow the delay of this change until mid-November 2024. The NoScriptSite setting will be configured to True for all existing SharePoint and OneDrive sites. Existing scripts in OneDrive and SharePoint sites will remain unaffected. Administrators can permit the execution of custom scripts on specific SharePoint sites using the Set-SPOSite command.

MC714186 – Updated March 27, 2024: Setting Custom scripts setting for a site in SharePoint tenant admin center will be fully available by early-April (Previously March)

There are changes happening to Custom script settings in March 2024.

The Custom Script setting, which determines if users can execute custom scripts on personal sites and self-service created sites will be removed.This setting is currently located in the SharePoint Admin Center, under Settings -> Classic Settings.
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A new PowerShell command, “DelayDenyAddAndCustomizePagesEnforcement”, has been introduced. This command is available in the SharePoint Online Management Shell version 16.0.24524.12000, or above which allows delay of the change to custom script set on the Tenant until mid-November 2024 (previously May).
Note: that while this cmdlet is available in the latest management shell, running the cmdlet will result in an error (The requested operation is part of an experimental feature that is not supported in the current environment) until March when the settings are shipped.* False (default) – for site collections where administrators enabled the ability to add custom script, SharePoint will revoke that ability within 24 hours from the last time this setting was changed.* True – All changes performed by administrators to custom script settings are preserved. When the value is set to true, a banner shows in the active sites list of the SharePoint admin center informing that changes to custom scripts are permanent.Set-SPOTenant DelayDenyAddAndCustomizePagesEnforcement $TruePlease be aware that the new PowerShell command will only be accessible until mid-November 2024 (previously May). Post that period, on SharePoint sites if administrators wish to continue using features that are only available when unmanaged custom scripts are permitted to run, they will need to re-enable the running of custom scripts every 24 hours. This option does not impact existing custom scripts.
The NoScriptSite setting will be configured to True for all existing SharePoint sites and OneDrive sites except for below mentioned sites templates.
BLANKINTERNETCONTAINER#0 = Classic Publishing Portal siteCMSPUBLISHING#0 = Publishing SiteBLANKINTERNET#0 = Publishing SiteGROUP#0 = Team siteAPPCATALOG#0 = App CatalogCSPCONTAINER#0 = CSP Container
The execution of existing scripts in OneDrive and SharePoint sites will remain unaffected.
There will not be an option to enable custom script on OneDrive sites once the delay set using DelayDenyAddAndCustomizePagesEnforcement ends in mid-November 2024 (previously May).
Customers will retain the ability to permit the execution of custom scripts on specific SharePoint sites using the Set-SPOSite <SiteURL> -DenyAddAndCustomizePages PowerShell command or from the Active sites page in the SharePoint Admin Center.
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Any modifications made to a site will be automatically reverted to False status within 24 hours, unless the new PowerShell command “DelayDenyAddAndCustomizePagesEnforcement” is used prior to mid-November 2024 (previously May). After mid-November 2024, the 24-hour reversion will occur regardless of this setting.

When this will happen:

The Custom Script setting from SharePoint admin center will be removed in March 2024.

The new PowerShell command will be available in March 2024.

How this will affect your organization:

When this Custom Script setting is removed, you will no longer be able to add, modify or remove scripts within OneDrive and SharePoint sites unless administrators temporarily allow that by turning the setting on specific sites. This will not impact the ability to execute existing scripts in OneDrive and SharePoint sites.

What you need to do to prepare:

No extensions will be granted beyond the mentioned period.

It may be beneficial to inform all site owners about this modification and make necessary updates to your training materials and documentation accordingly.

Review the following for additional information: Allow or prevent custom script