What is email set to in the USER section. Maintaining SSL is not a admin task the User does this. They should have gotten an email.
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Installing a Let's Encrypt Certificate
Probably easiest way to install secure, free and browsers trusted certificate for your site is Let's Encrpyt certificate, so we strongly recommend to use this method if you don't want to buy certificate from trusted authorities.
Note: You must enable let's encrpyt in DA to use it. If you don't see "Let's Encrpyt" section in SSL certificates menu, ask your admin to enable it. If you are admin, you can enable Let's Encrpyt by following
this guide.
To enable Let's Encrypt, choose "Free & automatic certificate from Let's Encrypt" radius.
Enter Common name and E-mail.
Note: do not use "www" or "http(s)://" in common name section.
Choose which Certificate Entries you want to secure. You can select maximum of 20.
Note: Always select yourdomain.com and
www.yourdomain.com entries.
Press "Save" button. That's it!
If they were an old Cpanel account you might need to look at this