Unable to parse Client credential token response error (Okta)

[freizl]

Client credential error token response

conduitTokenRequest - cannot fetch access token. error detail: TokenRequestError {error = UnknownErrorCode "", errorDescription = Just "Decode TokenRequestError failed: Error in $: key \"error\" not found\n Original Response:\n\"{\\\"errorCode\\\":\\\"invalid_client\\\",\\\"errorSummary\\\":\\\"A client_id must be provided in the request.\\\",\\\"errorLink\\\":\\\"invalid_client\\\",\\\"errorId\\\":\\\"oaeyeSqWRUQR2-fzxMYXUMifg\\\",\\\"errorCauses\\\":[]}\"", errorUri = Nothing}

Why its structure is diff than auth-code grant token request response?