In a blog post announcing Diablo IV’s first Closed Beta, the development team also stated that public testing will begin early next year. This goes in line with a statement made earlier this year at the XBox Games Showcase saying that all games displayed during the showcase including Diablo IV will be available to the public by June 2023.
If you have not received an email invite to the Diablo IV Closed Beta by November 18, then you have not been selected to participate.