diff --git a/libraries/microsoft-agents-activity/microsoft_agents/activity/activity.py b/libraries/microsoft-agents-activity/microsoft_agents/activity/activity.py
index b146a459..a21ec8c0 100644
--- a/libraries/microsoft-agents-activity/microsoft_agents/activity/activity.py
+++ b/libraries/microsoft-agents-activity/microsoft_agents/activity/activity.py
@@ -618,10 +618,15 @@ def create_typing_activity() -> "Activity":
         """
         return Activity(type=ActivityTypes.typing)
 
-    def get_conversation_reference(self) -> ConversationReference:
+    def get_conversation_reference(
+        self, force_base_channel: bool | None = None
+    ) -> ConversationReference:
         """
         Creates a ConversationReference based on this activity.
 
+        :param force_base_channel: Optional, when True use only the base channel value
+            from the channel id (for example ``msteams`` from ``msteams:copilot-web``).
+            Composite values are split only on the first ``:``.
         :returns: A conversation reference for the conversation that contains this activity.
         """
         return pick_model(
@@ -635,7 +640,11 @@ def get_conversation_reference(self) -> ConversationReference:
             user=copy(self.from_property),
             agent=copy(self.recipient),
             conversation=copy(self.conversation),
-            channel_id=self.channel_id,
+            channel_id=(
+                self.channel_id.split(":", 1)[0]
+                if force_base_channel and self.channel_id is not None
+                else self.channel_id
+            ),
             locale=self.locale,
             service_url=self.service_url,
         )
diff --git a/libraries/microsoft-agents-hosting-core/microsoft_agents/hosting/core/_oauth/_oauth_flow.py b/libraries/microsoft-agents-hosting-core/microsoft_agents/hosting/core/_oauth/_oauth_flow.py
index f396c17f..0c1369b4 100644
--- a/libraries/microsoft-agents-hosting-core/microsoft_agents/hosting/core/_oauth/_oauth_flow.py
+++ b/libraries/microsoft-agents-hosting-core/microsoft_agents/hosting/core/_oauth/_oauth_flow.py
@@ -187,7 +187,7 @@ async def begin_flow(self, activity: Activity) -> _FlowResponse:
 
         token_exchange_state = TokenExchangeState(
             connection_name=self._abs_oauth_connection_name,
-            conversation=activity.get_conversation_reference(),
+            conversation=activity.get_conversation_reference(force_base_channel=True),
             relates_to=activity.relates_to,
             ms_app_id=self._ms_app_id,
         )
diff --git a/tests/activity/test_activity.py b/tests/activity/test_activity.py
index 35a04893..f44667dc 100644
--- a/tests/activity/test_activity.py
+++ b/tests/activity/test_activity.py
@@ -66,6 +66,43 @@ def test_get_conversation_reference(self, activity):
         assert activity.locale == conversation_reference.locale
         assert activity.service_url == conversation_reference.service_url
 
+    def test_get_conversation_reference_force_base_channel(self, activity):
+        activity.channel_id = "msteams:copilot-web"
+
+        conversation_reference = activity.get_conversation_reference(
+            force_base_channel=True
+        )
+
+        assert conversation_reference.channel_id == "msteams"
+
+    @pytest.mark.parametrize(
+        "channel_id, expected_base_channel",
+        [
+            ("msteams", "msteams"),
+            ("msteams:copilot-web", "msteams"),
+            ("msteams:copilot:web", "msteams"),
+        ],
+    )
+    def test_get_conversation_reference_force_base_channel_variants(
+        self, activity, channel_id, expected_base_channel
+    ):
+        activity.channel_id = channel_id
+
+        conversation_reference = activity.get_conversation_reference(
+            force_base_channel=True
+        )
+
+        assert conversation_reference.channel_id == expected_base_channel
+
+    def test_get_conversation_reference_does_not_force_base_channel(self, activity):
+        activity.channel_id = "msteams:copilot-web"
+
+        conversation_reference = activity.get_conversation_reference(
+            force_base_channel=False
+        )
+
+        assert conversation_reference.channel_id == "msteams:copilot-web"
+
     def test_get_reply_conversation_reference(self, activity):
         reply = ResourceResponse(id="1234")
         conversation_reference = activity.get_reply_conversation_reference(reply)
diff --git a/tests/hosting_core/_oauth/test_oauth_flow.py b/tests/hosting_core/_oauth/test_oauth_flow.py
index 9fe4e3dc..aae663d6 100644
--- a/tests/hosting_core/_oauth/test_oauth_flow.py
+++ b/tests/hosting_core/_oauth/test_oauth_flow.py
@@ -32,25 +32,22 @@ def create_testing_Activity(
     value=None,
     text="a",
 ):
-    # mock_conversation_ref = mocker.MagicMock(ConversationReference)
     conversation_reference = ConversationReference(
         conversation={"id": "conv1"},
     )
-    mocker.patch.object(
-        Activity,
-        "get_conversation_reference",
-        return_value=conversation_reference,
-    )
-    return Activity(
+    activity = Activity(
         type=type,
         name=name,
         from_property=ChannelAccount(id=DEFAULTS.user_id),
+        recipient=ChannelAccount(id="agent-id"),
+        conversation={"id": "conv1"},
         channel_id=DEFAULTS.channel_id,
-        # get_conversation_reference=mocker.Mock(return_value=conv_ref),
+        service_url=DEFAULTS.service_url,
         relates_to=conversation_reference,
         value=value,
         text=text,
     )
+    return activity
 
 
 class TestUtils(FlowStateFixtures):
@@ -174,6 +171,9 @@ async def test_begin_flow_easy_case(self, mocker, flow_state, activity):
         mocker.patch.object(
             TokenExchangeState, "get_encoded_state", return_value="encoded_state"
         )
+        get_conversation_reference_spy = mocker.spy(
+            Activity, "get_conversation_reference"
+        )
         flow = _OAuthFlow(flow_state, user_token_client)
         expected_flow_state = flow_state
         expected_flow_state.tag = _FlowStateTag.COMPLETE
@@ -197,6 +197,9 @@ async def test_begin_flow_easy_case(self, mocker, flow_state, activity):
             activity.channel_id,
             "encoded_state",
         )
+        get_conversation_reference_spy.assert_any_call(
+            activity, force_base_channel=True
+        )
 
     @pytest.mark.asyncio
     async def test_begin_flow_long_case(self, mocker, flow_state, activity):