@andrew_plowright It shouldn’t have to do with your auth server config.
I just setup the sample myself and am not having issues. I see someone else had a similar issue at one point, perhaps their solution would help in your case?
Another option is to check out running auth-js in node here: okta-auth-js/samples/generated/express-web-with-oidc at master · okta/okta-auth-js · GitHub