diff --git a/libraries/Microsoft.Bot.Builder.Dialogs/Prompts/OAuthPrompt.cs b/libraries/Microsoft.Bot.Builder.Dialogs/Prompts/OAuthPrompt.cs
index cb4c4d8e93..15241622a8 100644
--- a/libraries/Microsoft.Bot.Builder.Dialogs/Prompts/OAuthPrompt.cs
+++ b/libraries/Microsoft.Bot.Builder.Dialogs/Prompts/OAuthPrompt.cs
@@ -153,7 +153,8 @@ public static async Task SendOAuthCardAsync(OAuthPromptSettings settings, ITurnC
                         cardActionType = ActionTypes.OpenUrl;
                     }
                 }
-                else if (!ChannelRequiresSignInLink(turnContext.Activity.ChannelId))
+                else if ((settings.ShowSignInLink != null && settings.ShowSignInLink == false) || 
+                    (settings.ShowSignInLink == null && !ChannelRequiresSignInLink(turnContext.Activity.ChannelId)))
                 {
                     value = null;
                 }
diff --git a/libraries/Microsoft.Bot.Builder.Dialogs/Prompts/OAuthPromptSettings.cs b/libraries/Microsoft.Bot.Builder.Dialogs/Prompts/OAuthPromptSettings.cs
index da55821a1d..0c434f8949 100644
--- a/libraries/Microsoft.Bot.Builder.Dialogs/Prompts/OAuthPromptSettings.cs
+++ b/libraries/Microsoft.Bot.Builder.Dialogs/Prompts/OAuthPromptSettings.cs
@@ -52,5 +52,12 @@ public class OAuthPromptSettings
         /// <value>True if the <see cref="OAuthPrompt"/> should automatically end upon receiving
         /// an invalid message.</value>
         public bool EndOnInvalidMessage { get; set; }
+
+        /// <summary>
+        /// Gets or sets an optional boolean value to force the display of a Sign In link overriding
+        /// the default behavior.
+        /// </summary>
+        /// <value>True to display the SignInLink.</value>
+        public bool? ShowSignInLink { get; set; }
     }
 }
diff --git a/libraries/Microsoft.Bot.Builder/Adapters/TestAdapter.cs b/libraries/Microsoft.Bot.Builder/Adapters/TestAdapter.cs
index 20f1f412ff..aefc517a18 100644
--- a/libraries/Microsoft.Bot.Builder/Adapters/TestAdapter.cs
+++ b/libraries/Microsoft.Bot.Builder/Adapters/TestAdapter.cs
@@ -164,7 +164,10 @@ public async Task ProcessActivityAsync(Activity activity, BotCallbackHandler cal
                     activity.Type = ActivityTypes.Message;
                 }
 
-                activity.ChannelId = Conversation.ChannelId;
+                if (activity.ChannelId == null)
+                {
+                    activity.ChannelId = Conversation.ChannelId;
+                }
 
                 if (activity.From == null || activity.From.Id == "unknown" || activity.From.Role == RoleTypes.Bot)
                 {
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Tests/OAuthPromptTests.cs b/tests/Microsoft.Bot.Builder.Dialogs.Tests/OAuthPromptTests.cs
index 08e342c13b..ae49ff91c1 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Tests/OAuthPromptTests.cs
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Tests/OAuthPromptTests.cs
@@ -589,6 +589,57 @@ public async Task OAuthPromptRecognizeTokenAsync_WithNullTextMessageActivity_Doe
             .StartTestAsync();
         }
 
+        [Theory]
+        [InlineData(null, Channels.Test, false)] //Do not override; ChannelRequiresSingInLink() returns false; Result: no link
+        [InlineData(null, Channels.Msteams, true)] //Do not override; ChannelRequiresSingInLink() returns true; Result: show link
+        [InlineData(false, Channels.Test, false)] //Override: no link; ChannelRequiresSingInLink() returns false; Result: no link
+        [InlineData(true, Channels.Test, true)] //Override: show link; ChannelRequiresSingInLink() returns false; Result: show link
+        [InlineData(false, Channels.Msteams, false)] //Override: no link; ChannelRequiresSingInLink() returns true; Result: no link
+        [InlineData(true, Channels.Msteams, true)] //Override: show link;  ChannelRequiresSingInLink() returns true; Result: show link
+        public async Task OAuthPromptSignInLinkSettingsCases(bool? showSignInLinkValue, string channelId, bool shouldHaveSignInLink)
+        {
+            var oAuthPromptSettings = new OAuthPromptSettings();
+            oAuthPromptSettings.ShowSignInLink = showSignInLinkValue;
+
+            var convoState = new ConversationState(new MemoryStorage());
+            var dialogState = convoState.CreateProperty<DialogState>("dialogState");
+
+            var adapter = new TestAdapter()
+                .Use(new AutoSaveStateMiddleware(convoState));
+
+            // Create new DialogSet
+            var dialogs = new DialogSet(dialogState);
+            dialogs.Add(new OAuthPrompt("OAuthPrompt", oAuthPromptSettings));
+
+            BotCallbackHandler botCallbackHandler = async (turnContext, cancellationToken) =>
+            {
+                var dc = await dialogs.CreateContextAsync(turnContext, cancellationToken);
+
+                var results = await dc.ContinueDialogAsync(cancellationToken);
+                if (results.Status == DialogTurnStatus.Empty)
+                {
+                    await dc.PromptAsync("OAuthPrompt", new PromptOptions(), cancellationToken: cancellationToken);
+                }
+            };
+
+            var initialActivity = new Activity()
+            {
+                ChannelId = channelId,
+                Text = "hello"
+            };
+            await new TestFlow(adapter, botCallbackHandler)
+                .Send(initialActivity)
+                .AssertReply(activity =>
+                {
+                    Assert.Single(((Activity)activity).Attachments);
+                    Assert.Equal(OAuthCard.ContentType, ((Activity)activity).Attachments[0].ContentType);
+                    var oAuthCard = (OAuthCard)((Activity)activity).Attachments[0].Content;
+                    var cardAction = oAuthCard.Buttons[0];
+                    Assert.Equal(shouldHaveSignInLink, cardAction.Value != null);
+                })
+                .StartTestAsync();
+        }
+
         private async Task OAuthPrompt(IStorage storage)
         {
             var convoState = new ConversationState(storage);