Transaction not yet indexed

AmT6cTggpY6SYAPmohC9t4cmkh6hFqNJbAzu1PaPiZBRmBDA9UDVXtiqUEUTSC4ntaWDXomZrPrqgoxNQz2nCC7

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