Transaction not yet indexed

u21mvQzCbKTbkh8FuiPvWFqeCzHum2smqUjCeWPfcpFCTEfjiXTQGNqaQMJHdEBNMsbAwWZzpEgykqA7R2T7tje

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