Transaction not yet indexed

Nk55ZAzJHAr7fyWkSLCTccHfvXVCKBD53dJF1CpZ7TQDTmaEsEGy7kqBctEkJrHeTbXSQw3X9hsMJXgNYbyE7mo

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