Unable to redirect to site after linking account

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Hi,
I’m linking two accounts using the identities endpoint as follows. Post linking, I want to redirect to my site as the primary user. However, after the following call, I end up with a 500 error (Oops!, something went wrong server_error: Internal error). Is anyone able to help me understand what might be wrong?

In the following, the ${fullTargetId} is the existingIdentity.provider+“|”+existingIdentity.user_id
and the ${newToken} is the token for the Auth0 Management API.

The call below does link the new account into the existing one with the expected Raw JSON.

 
   const url = `https://${event.secrets.domain}/api/v2/users/${fullTargetId}/identities`;
    var options = {
    method: 'POST',
    url: url,
    headers: {
      'Content-Type': 'application/json', 
      'Accept': 'application/json',
      'Authorization': `Bearer ${newToken}`
    },
    data: {
      "provider": event.connection.strategy,
      "connection_id": event.connection.id,
      "user_id": event.user.user_id
    }
  };

  await axios.request(options).then(function (response) {
    console.log(response.data);
    api.redirect.sendUserTo("http://localhost:3000");
  }).catch(function (error) {
    console.error(error);
  });