registration form associated with catalog menu item

Hi,

From what I understand you've enabled the "Redirect Joomla registration to HikaShop" plugin in order to redirect to HikaShop's registration form.
In the settings of that plugin, there is an option to enter the id of the menu item you want to be used for the registration form. If you don't specify anything, it will pick randomly a HikaShop menu item for you. So please configure that setting with the id of your hidden menu item.

Hi,

Then it means that your menu item is not configured properly.
For example, if you restricted it to some access level, the menu item won't be available for guest users. In that case, the plugin will automatically pick another menu item. Otherwise, if it was to use your menu item id, it would create a 404 error.

Hi,

If your homepage is not of the type of a HikaShop menu item then it is still invalid and thus it will still pick automatically another menu item for you. Using a menu item of one component to access a page of anoter component can often result in a 404 error.
From what I can see on your website, your homepage is not a hikashop page and so it's normal.
Please enter the id of a menu item of HikaShop which has the access level public and it will work.