Transaction not yet indexed

21UKHKYv8ubbVUdXESxnJ6Xf9kLZs9ZaV5eZP5dwir7Rrv5FYjum7TAkuRmbAwf1cXrtHVhz6q4Gv3RQhR8mWBm5

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