Transaction not yet indexed

PS28tL5EkRCWJ9jaqagSq2MXgCeBiLJ3fBQExsJhRpb6zh672TMpXzSf144dRwbxKe1HZBpHcN5DFzJTQL5pkbE

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