Transaction not yet indexed

NPL21BLSkDPhbUV9CMtfQmyN6vY8eAT5QCxpNXGZL4zPFePSjTx1Qc64kFfXMHfND2ANqQw3sWgaPoPH6ddXTp3

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