Hi @nhuang , my LangChain training participants sometimes hit this issue on newly created accounts and keys (personal key on the default workspace). Is there some security safeguard that kicks in somehow? I don’t hit this issue on my “older” key.
Related: Langchain_auth Client always return 403 even with valid Langsmith API key
Indirectly related (case of a service key) : LangSmith API Error: 403 Forbidden - org_scoped_key_requires_workspace