Transaction not yet indexed

a6UfRqqnFPnwkuKNS2E7fjdTL4Mdb7PcCXsgC3tpeKQcniS21mjGgjGBTxePJRrYTCUXtx7F6ZPfhbd6NeXqx18

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