diff --git a/packages/uipath/pyproject.toml b/packages/uipath/pyproject.toml
index ffaa7f881..5b63bd838 100644
--- a/packages/uipath/pyproject.toml
+++ b/packages/uipath/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "uipath"
-version = "2.10.81"
+version = "2.10.82"
 description = "Python SDK and CLI for UiPath Platform, enabling programmatic interaction with automation services, process management, and deployment tools."
 readme = { file = "README.md", content-type = "text/markdown" }
 requires-python = ">=3.11"
diff --git a/packages/uipath/src/uipath/_cli/_chat/_bridge.py b/packages/uipath/src/uipath/_cli/_chat/_bridge.py
index 96566e898..3310920ee 100644
--- a/packages/uipath/src/uipath/_cli/_chat/_bridge.py
+++ b/packages/uipath/src/uipath/_cli/_chat/_bridge.py
@@ -518,13 +518,22 @@ def get_chat_bridge(
     # Build headers from context
     headers = {
         "Authorization": f"Bearer {os.environ.get('UIPATH_ACCESS_TOKEN', '')}",
-        "X-UiPath-Internal-TenantId": f"{context.tenant_id}"
+        "X-UiPath-Internal-TenantId": context.tenant_id
         or os.environ.get("UIPATH_TENANT_ID", ""),
-        "X-UiPath-Internal-AccountId": f"{context.org_id}"
+        "X-UiPath-Internal-AccountId": context.org_id
         or os.environ.get("UIPATH_ORGANIZATION_ID", ""),
         "X-UiPath-ConversationId": context.conversation_id,
     }
 
+    # Conversation owner id (conversationalService.syntheticUserId) that CAS forwards via FpsProperties;
+    # always sent when present. It's there for RunAsMe=false, where the unattended robot's token
+    # subject is the robot account rather than the conversation owner, so CAS validates this presented
+    # id against conversation.user_id on the handshake instead of the token subject. Sent as a header
+    # (not a query param) to keep it out of access / load-balancer logs.
+    synthetic_user_id = getattr(context, "synthetic_user_id", None)
+    if synthetic_user_id:
+        headers["X-UiPath-Internal-SyntheticUserId"] = synthetic_user_id
+
     return SocketIOChatBridge(
         websocket_url=websocket_url,
         websocket_path=websocket_path,
diff --git a/packages/uipath/src/uipath/_cli/_chat/_voice_bridge.py b/packages/uipath/src/uipath/_cli/_chat/_voice_bridge.py
index 6164b9f3d..1e32f5b45 100644
--- a/packages/uipath/src/uipath/_cli/_chat/_voice_bridge.py
+++ b/packages/uipath/src/uipath/_cli/_chat/_voice_bridge.py
@@ -249,6 +249,15 @@ def get_voice_bridge(
         "X-UiPath-ConversationId": context.conversation_id,
     }
 
+    # Conversation owner id (conversationalService.syntheticUserId) that CAS forwards via FpsProperties;
+    # always sent when present. It's there for RunAsMe=false, where the unattended robot's token
+    # subject is the robot account rather than the conversation owner, so CAS validates this presented
+    # id against conversation.user_id on the handshake instead of the token subject. Sent as a header
+    # (not a query param) to keep it out of access / load-balancer logs.
+    synthetic_user_id = getattr(context, "synthetic_user_id", None)
+    if synthetic_user_id:
+        headers["X-UiPath-Internal-SyntheticUserId"] = synthetic_user_id
+
     return VoiceToolCallSession(
         url=url,
         socketio_path=socketio_path,
diff --git a/packages/uipath/tests/cli/chat/test_bridge.py b/packages/uipath/tests/cli/chat/test_bridge.py
index bbd385def..31b50e7df 100644
--- a/packages/uipath/tests/cli/chat/test_bridge.py
+++ b/packages/uipath/tests/cli/chat/test_bridge.py
@@ -206,6 +206,53 @@ def test_get_chat_bridge_constructs_correct_headers(
         assert "X-UiPath-ConversationId" in bridge.headers
         assert bridge.headers["X-UiPath-ConversationId"] == "conv-789"
 
+    def test_get_chat_bridge_falls_back_to_env_when_tenant_and_org_absent(
+        self, monkeypatch: pytest.MonkeyPatch
+    ) -> None:
+        """Tenant/account headers fall back to env vars when context values are None."""
+        monkeypatch.setenv("UIPATH_URL", "https://cloud.uipath.com/org/tenant")
+        monkeypatch.setenv("UIPATH_ACCESS_TOKEN", "my-access-token")
+        monkeypatch.setenv("UIPATH_TENANT_ID", "env-tenant")
+        monkeypatch.setenv("UIPATH_ORGANIZATION_ID", "env-org")
+
+        context = MockRuntimeContext(
+            tenant_id=None,  # type: ignore[arg-type]
+            org_id=None,  # type: ignore[arg-type]
+            conversation_id="conv-789",
+        )
+
+        bridge = cast(SocketIOChatBridge, get_chat_bridge(cast(Any, context)))
+
+        assert bridge.headers["X-UiPath-Internal-TenantId"] == "env-tenant"
+        assert bridge.headers["X-UiPath-Internal-AccountId"] == "env-org"
+
+    def test_get_chat_bridge_includes_synthetic_user_id_header_when_set(
+        self, monkeypatch: pytest.MonkeyPatch
+    ) -> None:
+        """Conversation owner id (from FpsProperties) is sent on the handshake for CAS to validate."""
+        monkeypatch.setenv("UIPATH_URL", "https://cloud.uipath.com/org/tenant")
+        monkeypatch.setenv("UIPATH_ACCESS_TOKEN", "my-access-token")
+
+        context = MockRuntimeContext(conversation_id="conv-789")
+        context.synthetic_user_id = "owner-guid"  # type: ignore[attr-defined]
+
+        bridge = cast(SocketIOChatBridge, get_chat_bridge(cast(Any, context)))
+
+        assert bridge.headers["X-UiPath-Internal-SyntheticUserId"] == "owner-guid"
+
+    def test_get_chat_bridge_omits_synthetic_user_id_header_when_absent(
+        self, monkeypatch: pytest.MonkeyPatch
+    ) -> None:
+        """No header is sent when the runtime has no owner id (backward compatible)."""
+        monkeypatch.setenv("UIPATH_URL", "https://cloud.uipath.com/org/tenant")
+        monkeypatch.setenv("UIPATH_ACCESS_TOKEN", "my-access-token")
+
+        context = MockRuntimeContext(conversation_id="conv-789")
+
+        bridge = cast(SocketIOChatBridge, get_chat_bridge(cast(Any, context)))
+
+        assert "X-UiPath-Internal-SyntheticUserId" not in bridge.headers
+
     def test_get_chat_bridge_raises_without_uipath_url(
         self, monkeypatch: pytest.MonkeyPatch
     ) -> None:
diff --git a/packages/uipath/tests/cli/chat/test_voice_bridge.py b/packages/uipath/tests/cli/chat/test_voice_bridge.py
index b945fb6e3..32c44af1e 100644
--- a/packages/uipath/tests/cli/chat/test_voice_bridge.py
+++ b/packages/uipath/tests/cli/chat/test_voice_bridge.py
@@ -135,3 +135,35 @@ def test_headers_fall_back_to_env_when_context_ids_are_none(
 
         assert bridge._headers["X-UiPath-Internal-TenantId"] == "env-tenant"
         assert bridge._headers["X-UiPath-Internal-AccountId"] == "env-org"
+
+    def test_includes_synthetic_user_id_header_when_set(
+        self, monkeypatch: pytest.MonkeyPatch
+    ) -> None:
+        """Conversation owner id (from FpsProperties) is sent on the handshake for CAS to validate."""
+        monkeypatch.setenv("UIPATH_URL", "https://cloud.uipath.com")
+        ctx = MagicMock(
+            conversation_id="conv-1",
+            tenant_id="t",
+            org_id="o",
+            synthetic_user_id="owner-guid",
+        )
+
+        bridge = get_voice_bridge(ctx, AsyncMock())
+
+        assert bridge._headers["X-UiPath-Internal-SyntheticUserId"] == "owner-guid"
+
+    def test_omits_synthetic_user_id_header_when_none(
+        self, monkeypatch: pytest.MonkeyPatch
+    ) -> None:
+        """No header is sent when the runtime has no owner id (backward compatible)."""
+        monkeypatch.setenv("UIPATH_URL", "https://cloud.uipath.com")
+        ctx = MagicMock(
+            conversation_id="conv-1",
+            tenant_id="t",
+            org_id="o",
+            synthetic_user_id=None,
+        )
+
+        bridge = get_voice_bridge(ctx, AsyncMock())
+
+        assert "X-UiPath-Internal-SyntheticUserId" not in bridge._headers
diff --git a/packages/uipath/uv.lock b/packages/uipath/uv.lock
index 62ecc13a0..773d25d8a 100644
--- a/packages/uipath/uv.lock
+++ b/packages/uipath/uv.lock
@@ -2552,7 +2552,7 @@ wheels = [
 
 [[package]]
 name = "uipath"
-version = "2.10.81"
+version = "2.10.82"
 source = { editable = "." }
 dependencies = [
     { name = "applicationinsights" },