The release of Google Analytics 4 is a big step up for web analytics and business owners, however at the time of writing this, there is no publicly available API to support third party services.
This means that if you create a new Analytics property we are not able to support the new features yet.
Good news though, there is a work around! When you go to create a new analytics property, if you select the option circled in the below screenshot you will still be able to use your analytics account with Admin 2020 whilst still taking advantage of the google analytics 4 features!
When google releases a public api for version 4 we will get to work on supporting the new features but for now, you can still get the best of both worlds with this handy work around!