Transaction not yet indexed

Mku6TwaioNifcGkjsV2mgKiyVWfg6XZn79qPaPBnWoTUgbjm7keprYJcEefmSdMLP8vwLFjKqjWCvHkNKuU5Kjs

The transaction signature is valid but not yet indexed by this RPC node, or the transaction failed before inclusion.