Transaction not yet indexed

21Z51MqJWurjPFcoja4kYH8PsWHvsChCVxSJzftFDVSAi8ce7YdC2Jdpd2nGY3tSJNYhxVhHnHVEYsnsYEZsZ1mx

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