diff --git a/litellm/proxy/management_endpoints/scim/scim_v2.py b/litellm/proxy/management_endpoints/scim/scim_v2.py
index e48f68a2d0a..66c2e54f5c6 100644
--- a/litellm/proxy/management_endpoints/scim/scim_v2.py
+++ b/litellm/proxy/management_endpoints/scim/scim_v2.py
@@ -1294,7 +1294,7 @@ async def _create_user_if_not_exists(user_id: str, created_via: str = "scim_grou
         if litellm.default_internal_user_params:
             default_role = litellm.default_internal_user_params.get("user_role")
 
-        new_user_request: Final = NewUserRequest(
+        new_user_request: Final = SCIMNewUserRequest(
             user_id=user_id,
             user_email=user_id,  # We don't have email from group membership
             user_alias=None,
@@ -1873,7 +1873,7 @@ async def create_user(
         admin_group: Final = await _get_scim_admin_group()
         resolved_role: Final = _resolve_scim_user_role(user.groups or [], admin_group, default_role)
 
-        new_user_request: Final = NewUserRequest(
+        new_user_request: Final = SCIMNewUserRequest(
             user_id=user_id,
             user_email=user_data["user_email"],
             user_alias=user_data["user_alias"],
diff --git a/litellm/types/proxy/management_endpoints/scim_v2.py b/litellm/types/proxy/management_endpoints/scim_v2.py
index fadb309e0cd..72a39c61967 100644
--- a/litellm/types/proxy/management_endpoints/scim_v2.py
+++ b/litellm/types/proxy/management_endpoints/scim_v2.py
@@ -13,6 +13,7 @@ from pydantic import (
 from pydantic_core.core_schema import SerializerFunctionWrapHandler
 
 from litellm.types.llms.base import LiteLLMBaseModel
+from litellm.types.proxy.management_endpoints.user_requests import NewUserRequest
 
 SCIM_ENTERPRISE_USER_SCHEMA: Final = "urn:ietf:params:scim:schemas:extension:enterprise:2.0:User"
 SCIM_ENTERPRISE_METADATA_KEY: Final = "scim_enterprise"
@@ -26,6 +27,14 @@ _SCIM_SERIALIZED_FIELDS_ADAPTER: Final = TypeAdapter(
 )
 
 
+class SCIMNewUserRequest(NewUserRequest):
+    """Preserve opaque directory IDs when provisioning SCIM users and group members."""
+
+    model_config = ConfigDict(frozen=True)
+
+    user_id: str | None = None
+
+
 class LiteLLM_UserScimMetadata(LiteLLMBaseModel):
     """
     Scim metadata stored in LiteLLM_UserTable.metadata
diff --git a/tests/unit/proxy/management_endpoints/scim/test_scim_v2_endpoints.py b/tests/unit/proxy/management_endpoints/scim/test_scim_v2_endpoints.py
index 180362f45f1..94e0f91ecd1 100644
--- a/tests/unit/proxy/management_endpoints/scim/test_scim_v2_endpoints.py
+++ b/tests/unit/proxy/management_endpoints/scim/test_scim_v2_endpoints.py
@@ -411,10 +411,11 @@ async def test_create_user_without_groups_defers_to_default_team(mocker: MockerF
 
 
 @pytest.mark.asyncio
-async def test_create_user_with_groups_keeps_idp_teams(mocker: MockerFixture, monkeypatch):
+@pytest.mark.parametrize("user_id", ["new-user", " employee-42 "])
+async def test_create_user_with_groups_keeps_idp_teams(mocker: MockerFixture, monkeypatch, user_id: str):
     scim_user = SCIMUser(
         schemas=["urn:ietf:params:scim:schemas:core:2.0:User"],
-        userName="new-user",
+        userName=user_id,
         emails=[SCIMUserEmail(value="new@example.com")],
         groups=[SCIMUserGroup(value="idp-team")],
     )
@@ -428,10 +429,12 @@ async def test_create_user_with_groups_keeps_idp_teams(mocker: MockerFixture, mo
     await create_user(user=scim_user)
 
     assert new_user_mock.call_args.kwargs["data"].teams == ["idp-team"]
+    assert new_user_mock.call_args.kwargs["data"].user_id == user_id
 
 
 @pytest.mark.asyncio
-async def test_create_user_if_not_exists_defers_to_default_team(mocker: MockerFixture, monkeypatch):
+@pytest.mark.parametrize("user_id", ["group-user", " employee-42 "])
+async def test_create_user_if_not_exists_defers_to_default_team(mocker: MockerFixture, monkeypatch, user_id: str):
     monkeypatch.setattr(
         "litellm.default_internal_user_params",
         {"teams": [{"team_id": "default-team", "max_budget_in_team": 25}]},
@@ -439,14 +442,15 @@ async def test_create_user_if_not_exists_defers_to_default_team(mocker: MockerFi
     )
     new_user_mock = mocker.patch(  # test-quality-ok: new_user is imported inside the helper, not injectable
         "litellm.proxy.management_endpoints.internal_user_endpoints.new_user",
-        AsyncMock(return_value=NewUserResponse(user_id="group-user", key="k")),
+        AsyncMock(return_value=NewUserResponse(user_id=user_id, key="k")),
     )
 
-    created = await _create_user_if_not_exists(user_id="group-user")
+    created = await _create_user_if_not_exists(user_id=user_id)
 
     assert created is not None
     assert new_user_mock.call_args.kwargs["data"].teams is None
     assert new_user_mock.call_args.kwargs["user_api_key_dict"] == UserAPIKeyAuth(user_role=LitellmUserRoles.PROXY_ADMIN)
+    assert new_user_mock.call_args.kwargs["data"].user_id == user_id
 
 
 @pytest.mark.asyncio