How can SignHash data using RSACryptoServiceProvider in dotnet 8

Question

From the code below if get RSA key from Stakeholders Certificate which is the file that I load from file with a password.

The code below does not work in two cases the first is rsaPrivateKey.ExportParameters(false) the privateKey!.SignHash(hash, oid) gives me errors when i set signHash using the above code i get exeception

Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware[1]
      An unhandled exception has occurred while executing the request.
      System.Security.Cryptography.CryptographicException: Object contains only the public half of a key pair. A private key must also be provided.

But if I set it to true rsaPrivateKey.ExportParameters(false) I get exceptions

Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware[1]
      An unhandled exception has occurred while executing the request.
      System.Security.Cryptography.CryptographicException: The requested operation is not supported.
         at System.Security.Cryptography.CngKey.Export(CngKeyBlobFormat format)
         at System.Security.Cryptography.RSACng.ExportParameters(Boolean includePrivateParameters)

How can I make it work in Windows 10 and dotnet 8 project i want to SignHash data using RSACryptoServiceProvider.

RSA rsaPrivateKey = this.StakeHolderCert.GetRSAPrivateKey();
RSAParameters rsaParams = rsaPrivateKey.ExportParameters(true);
var privateKey = new RSACryptoServiceProvider();
privateKey.ImportParameters(rsaParams);

byte[] fullArray = privateKey!.SignHash(hash, oid);
string _base64String3 = Convert.ToBase64String(fullArray);