Error getting response stream (Write: The authentication or decryption has failed.): SendFailure

Hello! I have a script that call a webservice over https build with swagger in C# and I´m getting: Error calling AuthenticatePost: Error getting response stream (Write: The authentication or decryption has failed.): SendFailure

I already imported all the certifies from the moztools.exe and even used certmgr.exe to add the url from where I call the webservice, but it didnt worked.

Now I´m using the ServicePointManager.ServerCertificateValidationCallback but it never enters my callback, here is my code:

 public Object CallApi(String path, RestSharp.Method method, Dictionary<String, String> queryParams, String postBody,
         Dictionary<String, String> headerParams, Dictionary<String, String> formParams, 
         Dictionary<String, FileParameter> fileParams, String[] authSettings)
     {
         var request = new RestRequest(path, method);

   
     //UpdateParamsForAuth(queryParams, headerParams, authSettings);

     // add default header, if any
     foreach(var defaultHeader in _defaultHeaderMap)
         request.AddHeader(defaultHeader.Key, defaultHeader.Value);

     // add header parameter, if any
     foreach(var param in headerParams)
         request.AddHeader(param.Key, param.Value);

     // add query parameter, if any
     foreach(var param in queryParams)
         request.AddParameter(param.Key, param.Value, ParameterType.GetOrPost);

     // add form parameter, if any
     foreach(var param in formParams)
         request.AddParameter(param.Key, param.Value, ParameterType.GetOrPost);

     // add file parameter, if any
     foreach(var param in fileParams)
         request.AddFile(param.Value.Name, param.Value.Writer, param.Value.FileName, param.Value.ContentType);

     if (postBody != null) // http body (model) parameter
         request.AddParameter("application/json", postBody, ParameterType.RequestBody);

     ServicePointManager.ServerCertificateValidationCallback += new RemoteCertificateValidationCallback((sender, certificate, chain, policyErrors) => { return true; });
     return (Object)RestClient.Execute(request);
 }

 public static bool RemoteCertificateValidationCallback(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
 {
     UnityEngine.Debug.Log("MyRemoteCertificateValidationCallback");
     bool isOk = true;
     // If there are errors in the certificate chain, look at each error to determine the cause.
     if (sslPolicyErrors != SslPolicyErrors.None)
     {
         for (int i = 0; i < chain.ChainStatus.Length; i++)
         {
             if (chain.ChainStatus[i].Status != X509ChainStatusFlags.RevocationStatusUnknown)
             {
                 chain.ChainPolicy.RevocationFlag = X509RevocationFlag.EntireChain;
                 chain.ChainPolicy.RevocationMode = X509RevocationMode.Online;
                 chain.ChainPolicy.UrlRetrievalTimeout = new TimeSpan(0, 1, 0);
                 chain.ChainPolicy.VerificationFlags = X509VerificationFlags.AllFlags;
                 bool chainIsValid = chain.Build((X509Certificate2)certificate);
                 if (!chainIsValid)
                 {
                     isOk = false;
                 }
             }
         }
     }
     return isOk;
 }

Why eventhoug I added the certificates it doesnt work, and why is the delegate callback not being called?

Thanks in advance.