Creating a Microsoft Dynamics 365 Business Central 2022 Wave 1 preview environment is now possible. You need to go to the Admin Center of the Business Central tenant and create a Sandbox and select the version. Make sure to select 20.x.xxxxx.x (Preview) and click Create.
To remember, Microsoft will sometimes remove these preview environments without giving any prior notices.
Thank you and Regards,
Tharanga Chandrasekara