Overview

Sectigo is listed as the certificate authority on any Comodo certificate issued after January 2019, while Comodo is listed on any certificate issued before that date. Both names are used to refer to the same business.

You must include your domain name when purchasing a premium Sectigo SSL certificate. Consider the following scenario:

www.example.com/example.com/example.com/example.com/example

Which one should you choose?

Neither of these solutions is superior than the other; it’s simply a matter of personal preference for how you want your domain to seem.

Just double-check that it matches how you set up your domain in your panel’s Manage Domains page.

To the right of your domain, click the Edit link in the Web Hosting column.
For your domain, the Manage Domains page appears:

Choose one of the three alternatives that you want to employ.
You’ll see the following options if your domain is set to Fully Hosted:
Allow it to be: Add WWW to Both
WWW should be removed.
Requests work both ways regardless of whether you add or delete WWW, but the Apache web server configuration rewrites them inside. Unless you have installed software on the domain that is configured internally to rewrite its URL to use the reverse of what you’ve selected in your panel, either is absolutely safe to use. If this is the case, you’ll need to update your installed software (such as WordPress, Joomla, ZenCart, and others) to use the URL you specified in the panel.
When you get an SSL certificate, you have the option of specifying your URL, which includes whether or not to include the www subdomain. GreggHost SSL certificates include an additional functionality that allows them to be used with both. However, you should still set up Secure Hosting for the correct domain/subdomain rather than relying on this feature to catch any errors.