How can the sign-out redirect URI be customized in a .NET 7.0 ASP.NET Core application?

Questions OAuth/OIDC
1

I am implementing single-sign-out in my .NET 7.0 ASP.NET Core application based on the following guide.

By default, the sign-out redirect URI that is used is as follows.

https://localhost:7197/signout/callback

I attempted to customize this URI by setting the OktaMvcOptions.PostLogoutRedirectUri property on the OktaMvcOptions instance that is passed to the AuthenticationBuilder.AddOktaMvc() method to the following value.

https://localhost:7197/signout/callback2

This does not appear to have any effect on the post_logout_redirect_uri query string parameter that is included in the request to the following URL. Note that I have redacted the Okta domain.

https://dev-XXXXXXXX.okta.com/oauth2/default/v1/logout

How should I be doing this?

Is there a more relevant guide that targets .NET 7.0 which I could be using?