Transaction not yet indexed

21mkzCzjjPhmL8vKVcQMX8guw2wPYhsbXEw15WAiQ9XAet5gmmpcckcQ7KfEL1Mh2aMiLXRbv5ubhnr3EacmEAe1

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