You must be online when you set up Xbox One for the first time. Without an internet connection, you can’t finish setup. After your Xbox has updated and you’ve added your profile, you can go offline. On the page I linked you can find help on how to set up your Xbox to use it offline.
How to Stream to Twitch on Xbox One - Lifewire Apr 15, 2020 How to Connect an Xbox One Controller to a PC | PCMag Feb 20, 2020 Does a new Xbox One require an internet connection for It is mentioned at support.xbox.com: Broadband Internet. You’ll need a broadband Internet connection to complete the initial Xbox One setup and to use some of the most exciting features, apps, and games. Learn how to use our easy connection wizard to connect your Xbox One console to your home network. It is mentioned here exactly why you need
Xbox One X set up guide | GamesRadar+
Xbox One S: 4K, HDR and what you need to know - Xbox Wire Aug 02, 2016
Set up your Xbox One console | Xbox Support
Is it safe (or smart) to stand your Xbox up vertically Jun 13, 2020 How to Set Screen Time Limits for Kids on an Xbox One Jul 14, 2017