EnvelopesAPI - Creating envelop exception on live

[cesar-albusac]

I just finished the go live process, and I created the new keys and I am using them as well. But I got this error

Error calling CreateEnvelope: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.

I am using a c# application. The exception is thrown in the Create Envelope method:

EnvelopeDefinition Envelope = new EnvelopeDefinition
            {
                EmailSubject = EmailSubject,
                Documents = EnvelopeDocuments,
                Recipients = new Recipients { Signers = Signers },
                Status = "sent"
            };

            return GetEnvelopesApi().CreateEnvelope(_AccountId, Envelope).EnvelopeId;

Where GetEnvelopesApi just call the public EnvelopesApi(Configuration configuration = null); of docusign.esign.api :

 private EnvelopesApi GetEnvelopesApi()
        {
            ApiClient Client = new ApiClient("https://docusign.net/restapi");

            Client.Configuration.AddDefaultHeader("Authorization", "Bearer " + GetAccessToken());

            return new EnvelopesApi(Client.Configuration);
        }

[cesar-albusac]

https://stackoverflow.com/questions/66600067/docusign-c-sharp-createenvelope-error-could-not-establish-trust-relationship-f/66628396#66628396