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I am trying to set some property bag values in SharePoint Online, specifically around SharePoint Designer access. The code below runs without error, but I do not see the propertybag value being updated in /_layouts/15/SharePointDesignerSettings.aspx. Is it not possible to update PropertyBag values in SharePoint Online?

$SiteUrl = ""
$context = New-Object Microsoft.SharePoint.Client.ClientContext($SiteUrl)
$context.Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($credential.UserName, $credential.Password)
$web = $context.Site.RootWeb
$props =  $web.AllProperties
$props.FieldValues["allowdesigner"] = 0
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up vote 9 down vote accepted

Works for me with a couple small changes. Instead of manipulating the FieldValues object, just manipulate the AllProperties object directly. Also, set the value to a string, not an int:

web.AllProperties["allowdesigner"] = "0";

Here's the full helper method I use:

public static void AddWebProperty(ClientContext ctx, string propertyName, string propertyValue)
    Web web = ctx.Web;

    web.AllProperties[propertyName] = propertyValue;
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I knew I was effing something up somewhere. Adapting this to the existing PowerShell I had then set the desired properties. – Eric Alexander Feb 16 at 14:34
You don't need to load properties. It's just unnecessary traffic. – dstarkowski Feb 16 at 14:35
@dstarkowski I wasn't sure, and never bothered to verify. I've edited the post to remove that. Thank you. – Derek Gusoff Feb 16 at 14:49

Derek's answer solves problem for property bag in general, but there's also Site.AllowDesigner property you could use for your specific case.

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Both great answers – Eric Alexander Feb 16 at 15:03

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