Transaction not yet indexed

21M51FLXxsAEppEyhPBP9jXvXTb3HAtAvXDyw7ezuYSXfKeNqWFLa8BBoDCnkMTEvEeWvFG9wc3oiWWrn7M5Dbf1

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