Facebook API Upload Custom Conversions

Im following Facebook's Graph API, trying to upload a Custom Conversion without success (https://developers.facebook.com/docs/marketing-api/audiences/guides/custom-audiences#upload). I managed to create the audience, nomalize and hash my data accordingly (I know this to be true as I us it on other requests) but can´t update my audience.

const upload = {
    "payload": {
        "schema": [
            "FN",
            "LN",
            "EMAIL",
        ],
        "data": users.transactions.map(transaction => ([
            normalizeData(transaction.customer.firstName),
            normalizeData(transaction.customer.lastName),
            normalizeData(transaction.customer.email),
        ]))
    },
    "access_token": access_token, 'www-authenticate': `OAuth "Facebook Platform" "invalid_request" "Unsupported post request. Object with ID 'xxxxxx' does not exist,
};



async function uploadUsersCA(audienceID, payload) {
    try {
        return await axios.post(`https://graph.facebook.com/${api_version}/${audienceID}/users`, payload);
    } catch (error) {
        console.error(error);
    }
}

Please help! I keep geting

status: 400,
statusText: 'Bad Request', 'www-authenticate': `OAuth "Facebook Platform" "invalid_request" "Unsupported post request. Object with ID 'xxxxxxxx' does not exist,

And I know as a fact it exists and have permisions as I can GET, DELETE it and more! I think the mistake could be on const upload, but cant find it, Please help!

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