Registration shortcode does not work

I put [gotowebinar] on page to show up lis of webinar
then i put [gotowebinar-reg] on other page and set it on settings as a custom registration page, when i click on Register (list) the registration page show this message instead of the form attended

“Thanks for using WP GoToWebinar. The shortcode has been implemented correctly. This page is required if you wish to display GoToWebinar registration forms on your own website. However this page requires a parameter at the end of the URL when accessed so the page knows what registration form to display for a given webinar. So on your upcoming webinars display when you click on a register link it will go to this page and send a parameter to it so that page knows what registration form to display. So if you were expecting a form here don’t worry everything is working fine.”

url is like /?page_id=42?webinarKey=6879006948868997902&hide=

what am i missing?

PHP Version: 7.3.17
Wordpress Version: 5.5.3
Plugin Version: 14.21
Current Theme: Twenty Seventeen
Application Used: Our Official Application
Active Plugins:
Elementor
WP GoToWebinar