Transaction not yet indexed

5b21tAzYEH5mkjgJng8sgG6Z9DsGhYdAsJMXPkCWjw9DAGNSCZrdmTUaQ1eqKjezAYPS2wRHUsdcf9AnVqa1cmtk

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