A Multiplayer API error, sent with HTTP 401. Status: the Multiplayer API is in private alpha; this code is part of its published contract.
When
The key is unknown or malformed.
What to do
Check the key in your environment (LOBBYLAB_PUBLISHABLE_KEY in the client, LOBBYLAB_SECRET_KEY on your backend).
The answer
Every error is a JSON body with a stable error code. Clients act on the codes they know and treat any other code as a failure of its HTTP status, and keep fields they do not know.
{
"error": "key_invalid",
"detail": "A sentence that is safe to show.",
"next": "Check the key in your environment (LOBBYLAB_PUBLISHABLE_KEY in the client, LOBBYLAB_SECRET_KEY on your backend).",
"docsUrl": "https://lobbylab.gg/docs/errors/key_invalid"
}See also: every error code, the API reference and the docs.