Transaction not yet indexed

Mx3U91mdDR9sNixAXGrPPaebdZTcsx3fRXtDHBjY2Y8TwwCr4r2dv3H8JLGPrMbGjjcJaPHHfdy6wGi3x2h7TM6

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