RSelenium - Unable to locate element using xpath

I'm trying to download an excel file from a subscription based service that I have access to. I am using RSelenium to access the page. I need to login and then navigate to the page where the excel sheet is provided. I am having trouble logging in. The code chunk I am using to open the webpage is:

library(dplyr)
library(tidyverse)
library(readxl)
library(RSelenium)
library(rvest)
library(wdman)

cDrv <- wdman::chrome()
remDr <-RSelenium::remoteDriver(browserName = "chrome",
                                port = 4444L)
remDr$open(silent=T)
remDr$navigate('https://benport.bentekenergy.com/')
remDr$getCurrentUrl()
Sys.sleep(10)
username_box <- remDr$findElement(using = c("xpath"), "//*[@id='username01']")

I can verify that the correct login page is opening after Javascript redirects the url to the login. After that, I try to locate the username textbox using xpath and the xpath location after inspecting the login field. The error I am receiving is below:

Selenium message:no such element: Unable to locate element: {"method":"xpath","selector":"//*[@id='username01']"}
  (Session info: chrome=90.0.4430.85)
For documentation on this error, please visit: https://www.seleniumhq.org/exceptions/no_such_element.html
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:25:53'
System info: host: '1de92a9de936', ip: '172.17.0.2', os.name: 'Linux', os.arch: 'amd64', os.version: '5.4.0-77-generic', java.version: '1.8.0_282'
Driver info: driver.version: unknown

Error:   Summary: NoSuchElement
     Detail: An element could not be located on the page using the given search parameters.
     class: org.openqa.selenium.NoSuchElementException
     Further Details: run errorDetails method

I'm not too sure what is going on. I've tried:

remDr$findElement(using = c("xpath"), "//*[@id='username01']")
remDr$findElement(using = c("id"), "username01")
remDr$findElement(using = c("xpath"), "//*[contains(text(), 'username01')]")
How many English words
do you know?
Test your English vocabulary size, and measure
how many words do you know
Online Test
Powered by Examplum