Transaction not yet indexed

MEXn9pMu9KBM54DNRUQSQLGmEnYoQWWNfPtg1gEwGVK7QSkjbdeUL21eJ3nQ7kDvnseQuk3hJSQWgFGqEMSTSPp

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