I was tripped up with something similar initially. First thing I would do is review the " Step 1: Setup your site" section of the FSE Editing handbook:
For me it was the realization that you have have a theme that supports it. The default twentytwentyone
theme doesn’t have that support, and instead you need to install the tt1-blocks
theme.
I was able to get things up and running like so:
-
Create new site in Local
-
Right-click on the site and select “Open Site Shell”
-
Use WPCLI to install Gutenberg and
tt1-blocks
wp theme install tt1-blocks --activate wp plugin install gutenberg --activate
-
Log into the site and see the new “Site Editor (Beta)” item in the menu
Good luck and have fun!