diff --git a/litellm/llms/oci/embed/transformation.py b/litellm/llms/oci/embed/transformation.py
index 26eff403590..cd28bc1031c 100644
--- a/litellm/llms/oci/embed/transformation.py
+++ b/litellm/llms/oci/embed/transformation.py
@@ -113,6 +113,29 @@ class OCIEmbedConfig(BaseEmbeddingConfig):
         api_key: Optional[str] = None,
         api_base: Optional[str] = None,
     ) -> dict:
+        if optional_params.get("oci_signer") is None:
+            creds = resolve_oci_credentials(optional_params)
+            missing = [
+                k
+                for k in (
+                    "oci_user",
+                    "oci_fingerprint",
+                    "oci_tenancy",
+                    "oci_compartment_id",
+                )
+                if not creds.get(k)
+            ]
+            if missing or not (creds.get("oci_key") or creds.get("oci_key_file")):
+                raise OCIError(
+                    status_code=401,
+                    message=(
+                        "Missing required parameters: oci_user, oci_fingerprint, oci_tenancy, "
+                        "oci_compartment_id and at least one of oci_key or oci_key_file. "
+                        "These can be supplied via optional_params or via OCI_USER, OCI_FINGERPRINT, "
+                        "OCI_TENANCY, OCI_COMPARTMENT_ID, OCI_KEY_FILE environment variables. "
+                        "Alternatively, provide an oci_signer object from the OCI SDK."
+                    ),
+                )
         return validate_oci_environment(headers, optional_params, api_key)
 
     def get_complete_url(