EquipItem endpoint returning 500 error

[egraves2]

I wrote a POST method for the EquipItem endpoint, but I keep getting a 500 error.

The body of my POST includes the correct itemId, characterId, and membershipType. My header includes the Authorization token. The url seems totally correct. So I'm having trouble figuring out why I'm getting this Internal Server Error. Any help would be super appreciated.

Here's my code:

const fetch = require('node-fetch')
let root = 'https://www.bungie.net/Platform'
    var equipEP = `/Destiny2/Actions/Items/EquipItem/`
    const url = root + equipEP
module.exports = async function(req,res){ 
    try {
    const {itemId} = req.query.itemId
    const {characterId} = req.query.characterId
    const {membershipType} = req.query.membershipType
    const {token} = req.query.token
  const r = await fetch(url, {
    method:'POST',
    headers:{ 
      'Authorization':`Bearer ${token}`, 
      'Content-Type':'application/x-www-form-urlencoded',
    },
    body: `itemId=${itemId}&characterId=${characterId}&membershipType=${membershipType}`
    })
  const result= await r.json()
res.status(200).send(result)
  } catch(e) {
      res.status(500).send(e.message)
  }

[justrealmilk]

itemHash or itemInstanceId?