Why in yii2 advanced API folder is not accessible by link?

Question

Yii

I created an api folder using the backend folder, deleted everything unnecessary from the config, session cache, etc.
In general, I did everything according to this guide
In common/botstrap.php I registered an alias

Yii::setAlias('@api', dirname(dirname(__DIR__)) . '/api');

at the root in codeception.yml added api

include:
- common
- frontend
- backend
- api

at the root in . htaccess added

RewriteCond %{REQUEST_URI} ^/(api)
RewriteRule ^.*$ /api/web/index.php [L]
And finally 404 what could be the reason?