Before enabling, make sure to complete mail settings in admin, to allow sending of email.

When this feature is enabled, upon registration, user will need to activate by confirming email. A 6-digit codes will be sent to user registered email. To complete registration, user needs to input the code to confirm login.

To enable or disable, go to app/Config/App.php $actions:

1. to disable use 'register' => null, or
2. to enable use the provided 'register' => \CodeIgniter\Shield\Authentication\Actions\EmailActivator::class