2FAuth/app/Http/Requests/UserStoreRequest.php

<?php

namespace App\Http\Requests;

use App\Rules\ComplyWithEmailRestrictionPolicy;
use Illuminate\Foundation\Http\FormRequest;

class UserStoreRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'name'  => 'unique:App\Models\User,name|required|string|max:191',
            'email' => [
                'unique:App\Models\User,email',
                'required',
                'string',
                'email',
                'max:191',
                new ComplyWithEmailRestrictionPolicy,
            ],
            'password' => 'required|string|min:8|confirmed',
        ];
    }

    /**
     * Prepare the data for validation.
     *
     * @return void
     */
    protected function prepareForValidation()
    {
        $this->merge([
            'email' => strtolower($this->email),
        ]);
    }
}