This is the (modified) snippet that Postman gives for successful call to my page.
var client = new RestClient("http://sub.example.com/wp-json/wp/v2/users/me");
var request = new RestRequest(Method.GET);
request.AddHeader("authorization", "Basic anVyYTp3MmZacmo2eGtBOHJsRWrt");
IRestResponse response = client.Execute(request);
But when placed in my c# app it returns 403 forbidden, while Postman makes it and recieves 200. The same thing happens when I use httpclient in my app (403).