diff --git a/litellm/proxy/_experimental/mcp_server/oauth_utils.py b/litellm/proxy/_experimental/mcp_server/oauth_utils.py
index 6ac3c8cf2a7..3f99784f2c4 100644
--- a/litellm/proxy/_experimental/mcp_server/oauth_utils.py
+++ b/litellm/proxy/_experimental/mcp_server/oauth_utils.py
@@ -13,6 +13,7 @@ from litellm.proxy.auth.ip_address_utils import IPAddressUtils
 # must not be cached — both success and error bodies may reveal secrets.
 TOKEN_NO_CACHE_HEADERS = {"Cache-Control": "no-store", "Pragma": "no-cache"}
 
+
 def get_request_base_url(request: Request) -> str:
     """
     Get the base URL for the request, considering X-Forwarded-* headers.
diff --git a/litellm/proxy/proxy_server.py b/litellm/proxy/proxy_server.py
index 002c1725d1a..f9e34f4e8c4 100644
--- a/litellm/proxy/proxy_server.py
+++ b/litellm/proxy/proxy_server.py
@@ -15276,7 +15276,8 @@ async def dynamic_mcp_route(mcp_server_name: str, request: Request):
         # Create a new scope with the correct path format that the MCP handler expects
         # Transform /{mcp_server_name}/mcp to /mcp/{mcp_server_name}
         scope = dict(request.scope)
-        scope["_original_path"] = scope.get("path", "")  # preserve for 401 URL form selection
+        # Preserve the public request path for OAuth challenge URL selection.
+        scope["_original_path"] = scope.get("path", "")
         scope["path"] = f"/mcp/{mcp_server_name}"
 
         # Import the MCP handler