Looking at the latest version of the layout.blade.php file from the package, I don't see any reference to any session. Also no reference to the session in the rest of the codebase. It's a full VUE frontend webpage, so there shouldn't be a session involved at all.
The only thing I can think of is that the authorization step is not working correctly. Maybe you need to change this to work with your token somehow? If you're working with the token you probably need to pass it to the VUE application as well. Otherwise, it can't know about it: https://docs.vapor.build/1.0/introduction.html#installing-the-vapor-ui-dashboard
It's probably also good to check if you're on the latest version or not.