How to sign NF-e XML in ASP.NET Core using the NF-e 4.00 signature defaults?

Good afternoon, I'm developing an API with ASP.NET Core, communicating with Sefaz to send the NF-e, however I'm having a problem signing the XML, below is the code that makes the signature:

var listas = xmlAssinar.GetElementsByTagName(infosTipoOperacao.TagAssinatura);

foreach (XmlNode nodes in listas)
{
    foreach (XmlNode childNodes in nodes.ChildNodes)
    {
        if (!childNodes.Name.Equals(infosTipoOperacao.TagAtributoId))
        {
            continue;
        }

        // Cria uma referência para ser assinado
        var reference = new Reference
        {
            DigestMethod = "http://www.w3.org/2000/09/xmldsig#sha1",
            Uri = string.Empty
        };

        // Pega o uri que deve ser assinada                                       
        var childElemen = (XmlElement)childNodes;

        if (childElemen.GetAttributeNode("Id") != null)
        {
            reference.Uri = string.Format("#{0}", childElemen.GetAttributeNode("Id").Value);
        }
        else if (childElemen.GetAttributeNode("id") != null)
        {
            reference.Uri = string.Format("#{0}", childElemen.GetAttributeNode("id").Value);
        }

        // Cria um objeto SignedXml
        var signedXml = new SignedXml(xmlAssinar)
        {                            
            // Adicione a chave ao documento SignedXml
            SigningKey = certificadoDigital.PrivateKey
        };

        // Adiciona uma transformação envelopada à referência
        var env = new XmlDsigEnvelopedSignatureTransform();
        reference.AddTransform(env);

        var c14 = new XmlDsigC14NTransform();
        reference.AddTransform(c14);

        // Adiciona a referência ao objeto SignedXml
        signedXml.AddReference(reference);

        // Cria um novo objeto KeyInfo
        var keyInfo = new KeyInfo();

        // Carrega o certificado em um objeto KeyInfoX509Data e adicione-o ao objeto KeyInfo
        keyInfo.AddClause(new KeyInfoX509Data(certificadoDigital));

        // Adiciona o objeto KeyInfo ao objeto SignedXml
        signedXml.KeyInfo = keyInfo;
        signedXml.ComputeSignature();

        // Obtém a representação XML da assinatura e salve-a em um objeto XmlElement
        var xmlDigitalSignature = signedXml.GetXml();

        // Grava o elemento no documento XML
        nodes.AppendChild(xmlAssinar.ImportNode(xmlDigitalSignature, true));
    }
}

xmlAssinar.PreserveWhitespace = false;

return xmlAssinar;

This code I also use in the ASP.NET Framework and it works normally, however when using Core, in the validation of NFe I get the following error:

  

The value of the 'Algorithm' attribute does not equal its fixed value

or

  

The value of the 'Algorithm' attribute is not equal to its fixed value

It was then that I realized that within the "PrivateKey" object in the Digital Certificate has a different return from the Framework return and I believe this is affecting the signature algorithm.

If anyone has any suggestions, I'll be grateful right away.