eSocial: Invalid Signature .NET Framework

Invalid Signature

Good afternoon, I have a problem transmitting information to eSocial webservices. The process I do is as follows: Event XMLs are generated on the server, returned to an application that runs on the client machine and is responsible for signing the events and performing the transmission to eSocial. The transmission of the batch is made and received successfully, but when querying the information through the query webservice (by the delivery receipt returned in the shipment) a code error 142 is returned and description Signature of the Invalid event. Suggested Actions: Check if event has changed after signing. Verify signature validity.

I'll put down the uploaded file and the method responsible for signing. (Certificate data has been omitted)

<eSocial xmlns="http://www.esocial.gov.br/schema/lote/eventos/envio/v1_1_1">
  <envioLoteEventos grupo="2">
    <ideEmpregador>
      <tpInsc>1</tpInsc>
      <nrInsc>95784204000177</nrInsc>
    </ideEmpregador>
    <ideTransmissor>
      <tpInsc>1</tpInsc>
      <nrInsc>05964161000119</nrInsc>
    </ideTransmissor>
    <eventos>
      <evento Id="ID1957842040001772018121314262900000">
        <eSocial xmlns="http://www.esocial.gov.br/schema/evt/evtToxic/v02_05_00">
          <evtToxic Id="ID1957842040001772018120609352600000">
            <ideEvento>
              <indRetif>0</indRetif>
              <tpAmb>2</tpAmb>
              <procEmi>1</procEmi>
              <verProc>01.00.00</verProc>
            </ideEvento>
            <ideEmpregador>
              <tpInsc>1</tpInsc>
              <nrInsc>95784204000177</nrInsc>
            </ideEmpregador>
            <ideVinculo>
              <cpfTrab>56641686094</cpfTrab>
              <nisTrab>12025177234</nisTrab>
              <matricula>621</matricula>
            </ideVinculo>
            <toxicologico>
              <dtExame>2018-12-06</dtExame>
              <indRecusa>S</indRecusa>
            </toxicologico>
          </evtToxic>
          <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
            <SignedInfo>
              <CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" />
              <SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256" />
              <Reference URI="">
                <Transforms>
                  <Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature" />
                  <Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" />
                </Transforms>
                <DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256" />
                <DigestValue>...</DigestValue>
              </Reference>
            </SignedInfo>
            <SignatureValue>...</SignatureValue>
            <KeyInfo>
              <X509Data>
                <X509Certificate>...</X509Certificate>
              </X509Data>
            </KeyInfo>
          </Signature>
        </eSocial>
      </evento>
    </eventos>
  </envioLoteEventos>
</eSocial>

Here is the code responsible for creating the batch and then the event signature.

var cl = new WSEsocial.Envio.ServicoEnviarLoteEventosClient();

cl.ClientCredentials.ClientCertificate.SetCertificate(cert.SubjectName.Name, System.Security.Cryptography.X509Certificates.StoreLocation.CurrentUser, System.Security.Cryptography.X509Certificates.StoreName.My);

XmlElement _getXmlElement(string xml)
{
  var d = new XmlDocument();
  d.LoadXml(_serviceSign.Sign(cert, xml).OuterXml);
  return d.DocumentElement;
}

var lote = new eSocial()
{
  envioLoteEventos = new eSocialEnvioLoteEventos()
  {
    grupo = (sbyte)model.GrupoEvento,
    ideEmpregador = new TIdeEmpregador()
    {
      nrInsc = model.UnidadeInsc,
      tpInsc = (sbyte)model.TipoInsc
    },
    ideTransmissor = new TIdeTransmissor()
    {
      nrInsc = cnpj,
      tpInsc = (sbyte)1
    },
    eventos = new eSocialEnvioLoteEventosEventos()
    {
      evento = model.Eventos.Select(x => new TArquivoEsocial
      {
        Id = x.Id,
        Any = _getXmlElement(x.XmlString)
      }).ToList()
    }
  }
};

public XmlDocument Sign(System.Security.Cryptography.X509Certificates.X509Certificate2 cert, string xmlString)
    {
      var doc = new XmlDocument();
      doc.PreserveWhitespace = false;
      doc.LoadXml(xmlString);

      Reference referenc = new Reference
      {
        Uri = string.Empty,
        DigestMethod = "http://www.w3.org/2001/04/xmlenc#sha256",
      };
      referenc.AddTransform(new XmlDsigEnvelopedSignatureTransform());
      referenc.AddTransform(new XmlDsigC14NTransform());
      referenc.DigestMethod = XmlSignatureExtensions.SHA256DIGEST;

      var kInfo = new KeyInfo();
      kInfo.AddClause(new KeyInfoX509Data(cert));


      var privKey   = (RSACryptoServiceProvider)cert.PrivateKey;
      var enhCsp    = new RSACryptoServiceProvider().CspKeyContainerInfo;

      var cspparams = new CspParameters(enhCsp.ProviderType, enhCsp.ProviderName, privKey.CspKeyContainerInfo.KeyContainerName);
      privKey       = new RSACryptoServiceProvider(cspparams);

      var signDoc = new SignedXml(doc)
      {
        KeyInfo = kInfo,
        SigningKey = privKey
      };
      signDoc.SignedInfo.SignatureMethod = "http://www.w3.org/2001/04/xmldsig-more#rsa-sha256";
      signDoc.SignedInfo.CanonicalizationMethod = SignedXml.XmlDsigC14NTransformUrl;
      signDoc.AddReference(referenc);


      signDoc.ComputeSignature();

      doc.DocumentElement.AppendChild(doc.ImportNode(signDoc.GetXml(), true));

      return doc;
    }

Thank you very much if someone can give me a light on. Thank you