Transaction not yet indexed

5u21i2aAiUNA66t16NLMAeU2drAdCCGcHhhgQSyZAepfRZLG4uDkyHYbcwasUsdzmQSoTtkrKq2v2eSPSPvQdEmE

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