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c# - .NET 5 SOAP WCF service ssl error client certificate

I try to connect to a SOAP service with the .NET 5 WCF-Framework and I've a problem with the client certificate. The client certificate is a "self-signed" generated (from SOAP-Service provider) ssl certificate. If I install the certificate on the windows keychain everything works fine, but I can't install the certificate on the production system, because the same certificate is used by many other customers. I think it's untrust if the windows trust a self-signed certificate (many users know the private key).

If the cert is not in the windows keychain the code throw this exception:

CommunicationException: An error occurred while sending the request.
HttpRequestException: An error occurred while sending the request.
WinHttpException: Could not establish trust relationship for the SSL/TLS secure channel with authority

Is theire any way to trust the certificate in .net? (ServicePointManager.ServerCertificateValidationCallback and ServerCertificateCustomValidationCallback not works)

BasicHttpsBinding bb = new BasicHttpsBinding();
bb.Security.Transport.ClientCredentialType = HttpClientCredentialType.Certificate;
SoapService x = new SoapService(bb, new EndpointAddress("[address]"));
X509Certificate2 clientCertificate = new X509Certificate2(System.IO.File.ReadAllBytes(path), [password]);
x.ClientCredentials.ClientCertificate.Certificate = clientCertificate;

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