Instructions on using software or a web site that bear no relation to how the software or web site actually works.
I know this is standard practice for any Microsoft product ever, mystery-meat navigation forcing you to resort to Google to figure out how to do things that should be basic functionality only to discover that of the dozen assorted results from people all having the same problem you're having exactly zero of them apply to the current state of the software because they've changed it yet again, but other vendors do this as well.
For example a friend of mine let me know that Vodafone have recently introduced WiFi calling, which you can enable as per the "How do I set up WiFi calling" section on this page. For the web site, it's My Vodafone > Services and Extras > Calling options, which doesn't exist. For the app, it's Manage Bars & Extras > Buy and manage extras > Calling options, which also doesn't exist. So ten out of ten for ISO 9000 repeatability, but minus several million for apparently not knowing how either your own web site or your own app works.