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Malformed transaction. NFTokenAcceptOffer


I'm trying to accept a token, but am getting a malformed transaction error. My request looks like this, let me know if there's anything obvious I'm doing wrong?

const request: XummJsonTransaction = {
    txjson: {
      TransactionType: 'NFTokenAcceptOffer',
      NFTokenBuyOffer: offerID,
      Account: accountID
    options: {
      return_url: {
        app: returnUrl,
        web: returnUrl
const subscription = await Xumm.payload

I successfully get a signing link, and it all looks right, up until I actually sign it.