The only issue you should expect is, when they download the app, make sure their internet is strong (I had my sister close any webpage she had open and make sure no one else is connected to the internet). Furthermore, to log in the app, they’re going to ask a 2 factor authentication. We chose the one that generate 10 back-up codes at a time.
each time you use a backup code to access, they’ll give you time to do as many attempts to take pics, after so many failed attempts, they log you out and you have to use another backup code to access.
Moral of the story: if you are using backup codes, once you get to the 9th, have them use a computer to log in to create 10 more so you have enough codes to do as many attempts.
sorry for the long post. That was just our experience.