diff --git a/litellm/proxy/guardrails/guardrail_hooks/presidio.py b/litellm/proxy/guardrails/guardrail_hooks/presidio.py
index 79c00948d5..48ffab39bd 100644
--- a/litellm/proxy/guardrails/guardrail_hooks/presidio.py
+++ b/litellm/proxy/guardrails/guardrail_hooks/presidio.py
@@ -1229,12 +1229,12 @@ class _OPTIONAL_PresidioPIIMasking(CustomGuardrail):
             for chunk in remaining_chunks:
                 yield chunk
 
-    async def async_post_call_streaming_iterator_hook(
+    async def async_post_call_streaming_iterator_hook(  # type: ignore[override]
         self,
         user_api_key_dict: UserAPIKeyAuth,
         response: Any,
         request_data: dict,
-    ) -> AsyncGenerator[Union[ModelResponseStream, bytes], None]:  # type: ignore[override]
+    ) -> AsyncGenerator[Union[ModelResponseStream, bytes], None]:
         """
         Process streaming response chunks to unmask PII tokens when needed.
 
diff --git a/litellm/realtime_api/main.py b/litellm/realtime_api/main.py
index 92e221577f..38964bd61f 100644
--- a/litellm/realtime_api/main.py
+++ b/litellm/realtime_api/main.py
@@ -1,7 +1,7 @@
 """Abstraction function for OpenAI's realtime API"""
 
 import os
-from typing import Any, Dict, Optional, Union, cast
+from typing import Any, Dict, Optional, cast
 
 import litellm
 from litellm.constants import REALTIME_WEBSOCKET_MAX_MESSAGE_SIZE_BYTES, request_timeout
@@ -98,15 +98,15 @@ def _get_realtime_http_provider_config(
 @wrapper_client
 async def acreate_realtime_client_secret(
     model: Optional[str] = None,
-    session: Optional[Union[Dict[str, Any], RealtimeSessionConfig]] = None,
-    expires_after: Optional[Union[Dict[str, Any], RealtimeExpiresAfter]] = None,
+    session: Optional[Dict[str, Any]] = None,
+    expires_after: Optional[Dict[str, Any]] = None,
     timeout: Optional[float] = None,
     **kwargs,
 ):
     req = RealtimeClientSecretRequest(
         model=model,
-        session=session,
-        expires_after=expires_after,
+        session=RealtimeSessionConfig(**session) if session else None,
+        expires_after=RealtimeExpiresAfter(**expires_after) if expires_after else None,
     )
     model_name = (
         (req.session.model if req.session is not None else None)