cPanel tells you when something needs attention.
WHAT YOU MAY RECEIVE
Notice that AutoSSL could not issue or renew a certificate for one or more domains Notice that a certificate is approaching expiry and renewal has not succeeded Confirmation of certificates issued, where notifications are configured for it
WHERE THEY GO
The contact address set in cPanel > Contact Information. Check this is current and monitored.
Set it to an address not on the domain being hosted. If the hosting is suspended or the domain lapses, a notice sent to an address on that domain cannot reach you.
WHAT TO DO WITH ONE
Do not ignore it. Open cPanel > SSL/TLS Status and click the named domain for the specific reason.
A failure notice that continues for weeks ends with an expired certificate and a browser warning on every visit.
COMMON REASONS FOR REPEATED NOTICES
A domain that no longer points here but is still on the account. Either repoint it, remove it, or exclude it from AutoSSL.