Get token from ADFS

I'm trying to obtain a token from ADFS to that I can use it with an on-premise Windows Service Bus installation. I may not have ADFS properly configured because I get the following message:

MSIS3127: The specified request failed.

The code to access the token is as follows:

    string adrecaSTS = "trust/13/usernamemixed";

    WS2007HttpBinding binding = new WS2007HttpBinding();

    binding.Security.Message.EstablishSecurityContext = false;
    binding.Security.Transport.ClientCredentialType = HttpClientCredentialType.None;
    binding.Security.Message.ClientCredentialType = MessageCredentialType.UserName;
    binding.Security.Mode = SecurityMode.TransportWithMessageCredential; //https

    string baseSSLUri = @"https://<myadfs>/adfs/services/";



    WSTrustChannelFactory trustChannelFactory = new WSTrustChannelFactory(binding, new EndpointAddress(baseSSLUri + adrecaSTS));
    trustChannelFactory.TrustVersion = TrustVersion.WSTrust13;
    trustChannelFactory.Credentials.UserName.UserName = "username";
    trustChannelFactory.Credentials.UserName.Password = "password";

    WSTrustChannel tokenClient = (WSTrustChannel)trustChannelFactory.CreateChannel();

    //create a token issuance issuance
    RequestSecurityToken rst = new RequestSecurityToken(RequestTypes.Issue);

    //call ADFS STS
    SecurityToken token = tokenClient.Issue(rst);

The endpoint is enabled on ADFS and my client (laptop on separate domain) trusts the certificate from ADFS.

Do I need to set up some kind of trust or something further? This error message is not particularly helpful.

See here:

https://github.com/thinktecture/Thinktecture.IdentityServer.v2/blob/master/src/Libraries/Thinktecture.IdentityServer.Protocols/WSFederation/HrdController.cs

The ValidateToken method has most of the code - but you first need to extract the InnerXml from the generic token and turn that into a SAML security token (again using a token handler).