Transaction not yet indexed

MM51U6tuMuUQphxL5Gg5E9VufSVvsAA3w3sEwBsqSHx14NTCk1nyqWgEvbbADmXvfwSERHqMEF2u6TxCvsGm2Ts

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