How to Read a SharePoint List Using .NET 8?

Question

System.Net.WebException: 'The remote server returned an error: (403) FORBIDDEN.'
I am using .NET 8, and I've already tried with GetACSAppOnlyContext but it wouldn't work because I need to access more than 5 SharePoint sites simultaneously. There was an error in CC.ExecuteQuery();

    using (CC = authManager.GetWebLoginClientContext(siteUrl))
    {
        List list = CC.Web.Lists.GetByTitle("TT_002_Test");
        CamlQuery oQuery = CamlQuery.CreateAllItemsQuery();
        ListItemCollection oCollection = list.GetItems(oQuery);
        CC.Load(oCollection);
        CC.ExecuteQuery();
	}