Problem "unknown" checking certificates

Checking certificates.
On some domains an incomprehensible message.
unknown: x509: certificate signed by unknown authority

What does this mean?
It is unclear on the reissue of the certificate.
Is there a date of creation of the certificate by which the certificate is considered defective?

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Apparently I messed up actually hitting the reply button whoops, deleted and fixed I think

This means the certificate issuer isn’t recognized by the service that is checking your site, typically a self signed certificate.

This is not related to the CAA problem and subsequent revocations, to get assistance with your webserver / certbot (or other ACME client) your best option would be to make a new post following the template.

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