Add to composer.json

"nextvikas/yii2-google-authenticator": "@dev"

or

composer require --prefer-dist "nextvikas/yii2-google-authenticator @dev"

Once the extension is installed, simply modify your application configuration as follows:

'modules' => [

    ----------------

    'authenticator' => [
        'class' => 'nextvikas\authenticator\Module',
        'twoStepVerification' => true,
    ],
],

--------------------

'bootstrap' => ['log','authenticator'],

Migrate Command:

yii migrate
php yii migrate --migrationPath=@nextvikas/authenticator/migrations

You can then access Next Authenticator through the following URL:

http://localhost/path/to/index.php?r=authenticator/default/scan

or if you have enabled pretty URLs, you may use the following URL:

http://localhost/path/to/index.php/authenticator/default/scan