Transaction not yet indexed

MNb6y2TaskF15QAhgAUMPieQt2Gg2akkXfQosXPRnTE8ce6w1WHbQPLcvuEVDVwGyDCoPbGn9nGqaV1q4e575Zn

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