Blazor Server App 8 and Antiforgery Token

I am trying to use an EditForm in an application with authentication and authorization working correctly. When I tried to submit an EditForm, I get this error:

A valid antiforgery token was not provided with the request. Add an antiforgery token, or disable antiforgery validation for this endpoint.

I have done the following in the Program.cs file:

builder.Services.AddAntiforgery(options =>{    options.FormFieldName = "AntiforgeryFieldname";    options.HeaderName = "X-CSRF-TOKEN-HEADERNAME";    options.SuppressXFrameOptionsHeader = false;    options.Cookie.HttpOnly = true;    options.Cookie.SameSite = SameSiteMode.Strict;    options.Cookie.IsEssential = true;    options.Cookie.SecurePolicy = CookieSecurePolicy.None;});// . . . // . . . app.UseAntiforgery();

In my EditForm on a Blazor component page, I have:

<EditForm method="post" Model="Membership" OnValidSubmit="AddMembership" FormName="create" Enhance><DataAnnotationsValidator /><ValidationSummary class="text-danger" />

When I looked at the page source, this is what the form looked like:

<form data-enhance="" method="post" action="/memberships/create"><input type="hidden" name="_handler" value="create" /><input type="hidden" name="AntiforgeryFieldname" value="CfDJ8KPOziIR...

I am not sure what I did wrong. Before implementing authentication and authorization, the EditForm worked correctly.

I expected this to work based on the Microsoft documentation.