It's unclear what is the problem you faced with, why your code didn't work.
Maybe you missind delay to wait for elments to be ready to accept input or click action?
Anyway, the following code works:
from selenium import webdriver
from selenium.webdriver.chrome.service import Service
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
options = Options()
options.add_argument("start-maximized")
webdriver_service = Service('C:\webdrivers\chromedriver.exe')
driver = webdriver.Chrome(service=webdriver_service, options=options)
url = 'https://system.arthuronline.co.uk/genieliew1/dashboards/index'
driver.get(url)
wait = WebDriverWait(driver, 20)
wait.until(EC.element_to_be_clickable((By.ID, 'username'))).send_keys("[email protected]")
wait.until(EC.element_to_be_clickable((By.ID, 'password'))).send_keys("thepassword")
wait.until(EC.element_to_be_clickable((By.CSS_SELECTOR, "button[type='submit']"))).click()
The result is:
