This has been happening a lot for brand new installs for various clients and readers emailing me.
If it’s an existing install that you’ve had for a while, often this can be solved by deactivating plugins and then reactivating them one by one. Usually it’s a plugin (or theme) that is adding something to the Add/Edit Post/Page screen
However with a new install you don’t have any of those to cause an issue and it’s one of those unusual cases.
The way to solve it it to go to Plugins > Add new and search for
Now the Text editor has the icons/buttons and the Visual Editor works too.