Create UserCustomAction for SharePoint Framework Extensions (Tenant-Scoped)

Question

I have created a SPFx Extension (Application Customizer - Tenant Scoped) and I have uploaded it to the App Catalog succesfully.

Now I'm trying to add it in a Site creating a UserCustomAction, but I'm getting the next error:

'ClientSideComponentId and ClientSideComponentProperties are not supported for actions that are not used for client-side extensions.'

This is the code for the creation of the UserCustomAction:

...
// var colCustomActions = cc.Web.UserCustomActions; // << also tried in the web
var colCustomActions = cc.Site.UserCustomActions;
var newCustomAction = colCustomActions.Add();                
newCustomAction.ClientSideComponentId = new Guid(guidFromTheManifest);
newCustomAction.ClientSideComponentProperties = "";
newCustomAction.Update();
cc.ExecuteQueryRetry();

Any hints? Do you have an example of the code for the creation of the UserCustomAction?

Thank you very much in advance.

Best regards.

Answer 1

This line was missing, the location property:

newCustomAction.Location = "ClientSideExtension.ApplicationCustomizer";

:)