transactions – Missing Witness field in p2wpkh decoded tx hex

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I have placed together a raw tx hex but when it’s unable to be broadcasted as I keep getting an error below

sendrawtransaction RPC error: {"code":-25,"message":"bad-txns-inputs-missingorspent"}

I then decoded the tx hex using https://live.blockcypher.com/btc/decodetx/ to see that I seem to be missing the Witness field as I am using native segwit addresses:

{
    "addresses": [
        "bc1qj3rjxzhlqm6fqesd5fwphjnf457zkww3s5qrv5",
        "bc1qjp3cch0hdvdr0hy99cs76kl9kekmuxv3k9nr6l"
    ],
    "block_height": -1,
    "block_index": -1,
    "confirmations": 0,
    "double_spend": false,
    "fees": 200,
    "hash": "88420211f5ea53174fc6a708c00ca2e840d687591573d0ecd2464fae20d139a7",
    "inputs": [
        {
            "addresses": [
                "bc1qj3rjxzhlqm6fqesd5fwphjnf457zkww3s5qrv5"
            ],
            "age": 696993,
            "output_index": 0,
            "output_value": 60200,
            "prev_hash": "74e24a2d50ba64abc099126c1c208b5f7156e3ad515b86f3edcca3f3d4291f66",
            "script": "4730440220516e15b6354f17e3f02711107624005e6ccd26cf61ef21b35e91315dfbd33e9f022049dadb73ca3e814de9da0b35ff20a8ca82147dda138ede948ccac5621a5bc1bb01210384485d43e938f8c68c4ac903d4d5a97fe842f66c12b860d8d2e1242d2b01fc1f",
            "script_type": "pay-to-witness-pubkey-hash",
            "sequence": 4294967295
        }
    ],
    "outputs": [
        {
            "addresses": [
                "bc1qjp3cch0hdvdr0hy99cs76kl9kekmuxv3k9nr6l"
            ],
            "script": "001490638c5df76b1a37dc852e21ed5be5b66dbe1991",
            "script_type": "pay-to-witness-pubkey-hash",
            "value": 60000
        }
    ],
    "preference": "low",
    "received": "2021-09-05T10:17:14.395062568Z",
    "relayed_by": "3.82.154.159",
    "size": 188,
    "total": 60000,
    "ver": 2,
    "vin_sz": 1,
    "vout_sz": 1,
    "vsize": 188
}

I then thought perhaps I didn’t add a scriptPubKey into the addInput but this code didn’t seem to work for me:

let keypairSpend = bitcoin.ECPair.fromWIF(WIF, MAINNET)

var scriptPubkey = bitcoin.script.witnessPubKeyHash.output.encode(bitcoin.crypto.hash160(keypairSpend.getPublicKeyBuffer()))

txb.addInput(txid, outn, null, scriptPubkey)

Any suggestions as to how I can add the Witness field into the tx? Is it because I am improperly adding the scriptPubKey?



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