From your WP Toolkit dashboard you may see the following error:
Click the link to Turn on redirect to HTTPS.
From the cPanel Domains list, make sure the Force HTTPS Redirect switch it turned on:
If you don't see a switch next to your domain name, you will see this message instead:
This is due to your domain being an addon domain. You need to turn on the switch next to your addon domains subdomain.
For example, if the primary domain on your account is abc.com and you've added on the domain xyz.com, there will be a subdomain called xyz.abc.com which will require the switch to be turned on.
cPanel hides these subdomains by default, so you will need to click the blue cog at the top right of the list and click on Show Associated Subdomains:
Now the sub domain will be listed and you can enable the SSL redirect.
