I always like this tutorial to get started: https://scotch.io/@neo/getting-started-with-laravel-passport
Anyway, no need to send the CSRF token. All your routes that go through the passport authentication should be placed in the routes/api.php file. API routes are stateless, so you can't check against the CSRF token. This also means you don't have to worry about it.
You send the access token on every request which authenticated the user. So instead of having a session, you check against the token. This is all handled by Laravel Passport