Thank you for waiting, as we had an unusually busy forum queue after the weekend.
You don't have to register this shortcode as it is part of the plugin "Toolset WooCommerce Blocks".
Can you please make sure that this plugin is installed and activated on the website? Also, make sure that the shortcode is added in the proper plain text format and not converted to any visual mode text with extra formatting, etc.
In case it still doesn't work, you're welcome to share temporary admin login details, along with the link to the example page.
Note: Your next reply will be private and making a complete backup copy is recommended before sharing the access details.