Let's Encypt SSL no longer offers "unlimited SSLs". It will secure limited number of domains on the server. It will also secure maximum 5 subdomains per cPanel account. If you have, let's say, 10 subdomains and 5 domain pointers (domain aliases), it will secure only 5.
You can renew specific domain or subdomain via cPanel > SSL/TLS status. There you can try to secure/run AUTOSSL manually or deselect unneeded SSLs to make room for others.
In some cases, SSL renewal fail due to server limits or API errors. To maintain your secure connection, we can install different free 90-day SSL manually. Multidomains will be also covered. Please submit support ticket with:
1. Main domain name for SSL renewal.
2. Subdomains or addons, if you have any under that cPanel account. For example, billing.domain.com or blog.domain.com. Up to 3 per account.
IMPORTANT: please make sure that you have firstname.lastname@example.org OR email@example.com email account. New SSL (certificate key) will be sent there. If you use external MX provider like Google/Gmail, please provide us firstname.lastname@example.org account and password. If you do not wish to provide it, please approve SSL request per email instructions.
Your SSL will be installed within 2 business days free of charge. You must renew free Sectigo SSL manually every 90 days. If you can't renew manually every 3 months, please consider the following:
1. Order $5/year SSL maintenance from us. We'll manually renew your SSL 4 times a year OR
2. Purchase convenient commercial grade 1 year SSLs from Sectigo ($12 per year) or RapidSSL ($19 per year). You can order commercial SSLs in our store (under "Order New Service").