Laravel session not being forgot before redirect

i'm trying to forget some session key's and then redirect the user (redirect() doesn't work so I use header()) to an external website.

I have noticed however that these session keys are persisting.

class CognitoUserProvider
{    
    /**
     * @return void
     */
    private function sendToLoginPage(): void
    {
        request()->session()->forget([ 'access_token', 'id_token', 'refresh_token' ]);
        
        $query = http_build_query([
            'client_id' => $this->clientId,
            'response_type' => 'code',
            'redirect_uri' => 'https://localhost/'
        ]);
        
        session([ 'redirect_url' => URL::current() ]);
        header("Location: https://{$this->domain}/login?$query&scope=email+openid");
        exit;
    }

// AuthServiceProvider.php

public function boot()
{
    $this->registerPolicies();
    
    Auth::extend('cognito', static function () {
        return new CognitoUserProvider();
    });
}

Any ideas?