input标记的Name属性包含unique_vehicle_id。已经使用相同的方法为该元素构建了Xpath。

//input[contains(@name,'unique_vehicle_id')]

并且需要使用一些等待，要么隐式等待要么显式等待来定位元素并与之交互。
1.使用隐式等待

# Imports required
from selenium import webdriver
from selenium.webdriver.common.by import By
from webdriver_manager.chrome import ChromeDriverManager
from selenium.webdriver.chrome.service import Service
import time

driver = webdriver.Chrome(service=Service(ChromeDriverManager().install()))
driver.maximize_window()
driver.implicitly_wait(10)

driver.get("https://ee.conifr.com.au/single/9KKQb0af?ref=12_27_32")

input1 = driver.find_element(By.XPATH,"//input[contains(@name,'unique_vehicle_id')]")
input1.send_keys("unique id")
time.sleep(5) # just to see if the text was entered in the field

1.使用显式等待

#Imports required for Explicit waits
from selenium.webdriver.support.wait import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

driver.get("https://ee.conifr.com.au/single/9KKQb0af?ref=12_27_32")

wait = WebDriverWait(driver,30)
input1 = wait.until(EC.element_to_be_clickable((By.XPATH,"//input[contains(@name,'unique_vehicle_id')]")))
input1.send_keys("unique id")
time.sleep(5)