NET::ERR_CERT_AUTHORITY_INVALID for Subdomain

We have this issue with 1 subdomain. We use flex ssl and one certificate on domain and 2 subdomains. There are no redirection in .htaccess. How we can fix it?

the domain and other subdomain works well and redirect from www to without www version. we have this issue with 1 subdomain only.

Is this a first level subdomain, or below that?

sub.example.com (first level) or sub.sub.example.com (second level)?

Universal certificates only cover the first level of subdomain, while you can get a dedicated certificate to cover multi-level subdomains.

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