Rosetta Transaction API giving null result

[bmalepaty]

When trying to hit the Rosetta Transaction API, to get transaction details, null response is received.
API Request: POST /block/transaction
{"network_identifier": { "blockchain": "DeSo", "network": "MAINNET" }, "block_identifier": { "index": 5420, "hash": "00000000001213663791bc6a73a58da09e818ab29f908942d67e8ff03436b40c" }, "transaction_identifier": { "hash": "423509bb9a039197cc09115b5ea582d253909a6c58933ca88c661aa9a2c55063" } }

Response Received:
{ "transaction": { "transaction_identifier": null, "operations": null } }