invoiceninja/app/Policies/UserPolicy.php

<?php
/**
 * Invoice Ninja (https://invoiceninja.com).
 *
 * @link https://github.com/invoiceninja/invoiceninja source repository
 *
 * @copyright Copyright (c) 2020. Invoice Ninja LLC (https://invoiceninja.com)
 *
 * @license https://opensource.org/licenses/AAL
 */

namespace App\Policies;

use App\Models\CompanyUser;
use App\Models\User;

/**
 * Class UserPolicy.
 */
class UserPolicy extends EntityPolicy
{
    /**
     *  Checks if the user has create permissions.
     *
     * @param  User $user
     * @return bool
     */
    public function create(User $user) : bool
    {
        return $user->isAdmin() || $user->hasPermission('create_user') || $user->hasPermission('create_all');
    }

    /*
    *
    * We need to override as User does not have the company_id property!!!!!
    *
    * We use the CompanyUser table as a proxy
    */
    public function edit(User $user, $user_entity) : bool
    {
        $company_user = CompanyUser::whereUserId($user->id)->AuthCompany()->first();

        return $user->isAdmin() && $company_user;
    }
}