Transaction not yet indexed

5991ECmTU2Awd1nWNw5qGN2Rv2b2LmwXV2KjiQCsrRiQBn2XZoRRaj2PMoFWftCqnefXCeMtNS1pfeHpigb4Qdp9

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