Unable to click an element within iframe in IE - selenium

Question

I want to click on an element as follows:
//select[#name='instructionSelection']
But its not clicking with Selenium on IE 11.
HTML:

Answer 1

You have to switch to iframe using name=InvoiceDeatils before interacting with the element.
Not sure which language you are using. Providing the snippet in python below.
driver.switch_to.frame(driver.find_element_by_name('InvoiceDeatils'))
# now click on the element
driver.find_element_by_xpath("//select[#name='instructionSelection']").click()

Answer 2

As the the desired element is within an <iframe> so to invoke click() on the element you have to:
Induce WebDriverWait for the desired frame to be available and switch to it.
Induce WebDriverWait for the desired element to be clickable.
You can use the following Locator Strategies::
Using CSS_SELECTOR:
WebDriverWait(driver, 10).until(EC.frame_to_be_available_and_switch_to_it((By.CSS_SELECTOR,"iframe[name='invoiceDeatils'][src*='invoiceDeatils']")))
WebDriverWait(driver, 10).until(EC.element_to_be_clickable((By.CSS_SELECTOR, "select[name='instructionSelection']"))).click()
Using XPATH:
WebDriverWait(driver, 10).until(EC.frame_to_be_available_and_switch_to_it((By.XPATH,"//iframe[#name='invoiceDeatils' and contains(#src, 'invoiceDeatils')]")))
WebDriverWait(driver, 10).until(EC.element_to_be_clickable((By.XPATH, "//select[#name='instructionSelection']"))).click()
Note : You have to add the following imports :
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
Reference
You can find a relevant discussion in:
Ways to deal with #document under iframe