Submit PoW solution to Ergo node

I am trying to submit a PoW solution to the node but I have some problems/questions.
I am sending the following data to ‘/mining/solution’

const data =
        pk: pk, 
        w: blockHash,
        n: nonce1,
        d: target

Is this correct? I get the following error:

curl -X POST "" -H "accept: application/json" -H "Content-Type: application/json" -d "{\"pk\":\"028db890e82ac002d0a35a58c039add6fd5e09433d399cfb906e33xxxxxxxxxxxxxx\",\"w\":\"0f03036485fec177a6ed9ae353aca3b3397eca2b07ce70a10c1877b3c8c8bb9c\",\"n\":\"d5ac1607994034c4\",\"d\":32199708657929542231435622529375625252308001641435781459345408}"

  "error" : 400,
  "reason" : "bad.request",
  "detail" : "requirement failed: Not enough bytes in the buffer: 33"

pk is the public key
w is the blockhash
n is the nonce
b is the target difficulty of the network (3.xx P at this moment)

Do I have to modify something in ‘ergo.conf’? the values that I am passing are the correct ones?
I know that the nonce does not meet network target but should’t I get another error instead?

If someone can help me I would appreciate it since there is little to no info on how to make this work.

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