diff --git a/litellm/llms/vertex_ai/vertex_llm_base.py b/litellm/llms/vertex_ai/vertex_llm_base.py
index 9349fb56da9..b758f20ea70 100644
--- a/litellm/llms/vertex_ai/vertex_llm_base.py
+++ b/litellm/llms/vertex_ai/vertex_llm_base.py
@@ -312,7 +312,7 @@ class VertexBase:
                 )
             except Exception as e:
                 verbose_logger.exception(
-                    f"Failed to load vertex credentials. Check to see if credentials containing partial/invalid information. Error: {str(e)}"
+                    f"Failed to load vertex credentials. Check to see if credentials containing partial/invalid information. Tried using project_id: {project_id}. Error: {str(e)}"
                 )
                 raise e
 
diff --git a/litellm/proxy/pass_through_endpoints/llm_passthrough_endpoints.py b/litellm/proxy/pass_through_endpoints/llm_passthrough_endpoints.py
index 21df55c0840..2fdb289e3ce 100644
--- a/litellm/proxy/pass_through_endpoints/llm_passthrough_endpoints.py
+++ b/litellm/proxy/pass_through_endpoints/llm_passthrough_endpoints.py
@@ -687,8 +687,8 @@ async def _base_vertex_proxy_route(
         headers.pop("content-length", None)
         headers.pop("host", None)
     else:
-        vertex_project = vertex_credentials.vertex_project
-        vertex_location = vertex_credentials.vertex_location
+        vertex_project = vertex_credentials.vertex_project or vertex_project
+        vertex_location = vertex_credentials.vertex_location or vertex_location
         vertex_credentials_str = vertex_credentials.vertex_credentials
 
         _auth_header, vertex_project = await vertex_llm_base._ensure_access_token_async(