Metaアカウントのメールアドレスはこちらで確認可能です。
https://auth.meta.com/settings/account/Those who would like to participate in the beta version of SnowCanvas, please enter your meta account email address to this form. As soon as your email address is registered, a confirmation email will be sent. After that, you will be able to download SnowCanvas from the AppLab on the Meta Quest Store by searching "SnowCanvas" on it.
Please note that as it is in beta, only 300 slots are available on a first come first serve basis.
You can check your Meta account email address here.
https://auth.meta.com/settings/account/