You can register for a chance to participate in The Division 2 Beta on the official The Division 2 website.
Simply select your platform, click on Sign Up Now and log in with your Ubisoft Account.
If you would like to manage your Beta participation (e.g. changing your registered platform), check out this article for more information.
To know more about the Registration process, feel free to visit this article.
Should you encounter issues, don't hesitate to contact us!