addressing pull request comments.

src/System.ServiceModel.Federation/src/System/ServiceModel/Federation/IWSTrustChannelContract.cs

@@ -13,7 +13,6 @@ namespace System.ServiceModel.Federation
     /// A service contract that defines the Issue request.
     /// </summary>
     [ServiceContract]
-    [ComVisible(false)]
     public interface IWSTrustChannelContract : IWSTrustContract
     {
         /// <summary>

src/System.ServiceModel.Federation/src/System/ServiceModel/Federation/WSTrustChannel.cs

@@ -23,32 +23,11 @@ public class WSTrustChannel : IWSTrustChannelContract, IChannel, ICommunicationO
         /// Constructs a <see cref="WSTrustChannel" />.
         /// </summary>
         /// <param name="channelfactory">The <see cref="ChannelFactory" /> that is creating this object.</param>
-        /// <param name="trustVersion">The version of WS-Trust this channel will use for serializing <see cref="Message" /> objects.</param>
-        public WSTrustChannel(ChannelFactory channelFactory,
-                              WsTrustVersion trustVersion)
-        {
-            if (!(channelFactory is IRequestChannel requestChannel))
-                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetResourceString(SR.ChannelFactoryMustSupportIRequestChannel)));
-
-            Initialize(channelFactory, requestChannel, trustVersion);
-        }
-
-        /// <summary>
-        /// Constructs a <see cref="WSTrustChannel" />.
-        /// </summary>
-        /// <param name="channelfactory">The <see cref="Federation.ChannelFactory" /> that is creating this object.</param>
         /// <param name="requestChannel">The <see cref="IRequestChannel" /> this object will be used to send and receive <see cref="Message" /> objects.</param>
         /// <param name="trustVersion">The version of WS-Trust this channel will use for serializing <see cref="Message" /> objects.</param>
         public WSTrustChannel(ChannelFactory channelfactory,
                               IRequestChannel requestChannel,
                               WsTrustVersion trustVersion)
-        {
-            Initialize(channelfactory, requestChannel, trustVersion);
-        }
-
-        private void Initialize(ChannelFactory channelfactory,
-                              IRequestChannel requestChannel,
-                              WsTrustVersion trustVersion)
         {
             _ = channelfactory ?? throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull(nameof(channelfactory));
             _ = requestChannel ?? throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull(nameof(requestChannel));

src/System.ServiceModel.Federation/src/System/ServiceModel/Federation/WSTrustChannelFactory.cs

@@ -2,7 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-using System.Runtime.InteropServices;
 using System.ServiceModel.Channels;
 using System.ServiceModel.Description;
 using Microsoft.IdentityModel.Protocols.WsTrust;
@@ -12,19 +11,8 @@ namespace System.ServiceModel.Federation
     /// <summary>
     /// A <see cref="WSTrustChannelFactory" /> that produces <see cref="WSTrustChannel" /> objects used to communicate with a WS-Trust endpoint.
     /// </summary>
-    [ComVisible(false)]
     public class WSTrustChannelFactory : ChannelFactory<IWSTrustChannelContract>
     {
-        /// <summary>
-        /// Initializes a new instance of the <see cref="WSTrustChannelFactory" /> class with a specified endpoint.
-        /// configuration name.
-        /// </summary>
-        /// <param name="endpointConfigurationName">The configuration name used for the endpoint.</param>
-        public WSTrustChannelFactory(string endpointConfigurationName)
-            : base(endpointConfigurationName)
-        {
-        }
-
         /// <summary>
         /// Initializes a new instance of the <see cref="WSTrustChannelFactory" /> class with a specified endpoint.
         /// </summary>
@@ -34,17 +22,6 @@ public WSTrustChannelFactory(ServiceEndpoint endpoint)
         {
         }
 
-        /// <summary>
-        /// Initializes a new instance of the <see cref="WSTrustChannelFactory" /> class associated with a specified
-        /// name for the endpoint configuration and remote address.
-        /// </summary>
-        /// <param name="endpointConfigurationName">The configuration name used for the endpoint.</param>
-        /// <param name="remoteAddress">The <see cref="EndpointAddress" /> that provides the location of the service.</param>
-        public WSTrustChannelFactory(string endpointConfigurationName, EndpointAddress remoteAddress)
-            : base(endpointConfigurationName, remoteAddress)
-        {
-        }
-
         /// <summary>
         /// Initializes a new instance of the <see cref="WSTrustChannelFactory" /> class with a specified binding
         /// and endpoint address.

src/System.ServiceModel.Federation/src/System/ServiceModel/Federation/WSTrustUtilities.cs

@@ -17,7 +17,7 @@ namespace System.ServiceModel.Federation
     /// <see cref="WSTrustChannelSecurityTokenProvider"/> has been designed to work with the <see cref="WSFederationHttpBinding"/> to send a WsTrust message to obtain a SecurityToken from an STS. The SecurityToken is
     /// added as an IssuedToken on the outbound WCF message.
     /// </summary>
-    public static class WSTrustUtilities
+    internal static class WSTrustUtilities
     {
         /// <summary>
         /// Gets the WsTrustVersion for the current MessageSecurityVersion.

src/System.ServiceModel.Federation/tests/WSTrustChannelFactoryTest.cs

@@ -11,7 +11,7 @@ public static class WSTrustChannelFactoryTest
         [WcfFact]
         public static void DefaultWSTrustChannelFactory()
         {
-            WSTrustChannelFactory trustChannelFactory = new WSTrustChannelFactory((string)null, null);
+            WSTrustChannelFactory trustChannelFactory = new WSTrustChannelFactory(null, null);
         }
     }
 }