Transaction not yet indexed

MpztkAJSRnmesPFLb5f5RsKDHEKmjr7uNouD2P5rspvUfEXU7F7pgGJgtFP6y8pWhdU7b24XSQqu4VH2x9yqA7c

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