会话在重定向到其他网站后丢失asp.net

这是我的会话状态：

<sessionState timeout="1200" mode="SQLServer" cookieSameSite="None" cookieless="false" allowCustomSqlDatabase="true" 
sqlConnectionString="Data Source=18.2xx.xxx.xx;User ID=UserName;Password=xxx;Initial Catalog=SessionDB;" />

但是当我的页面再次加载时，会话将丢失

 Response.Cookies["ASP.NET_SessionId"].SameSite = SameSiteMode.None;

 Response.Cookies.Add(new HttpCookie("key", "value")
 {
     SameSite = SameSiteMode.None,
     Secure = true,
 });

 Response.Redirect(payResult.UCD_URL, false);