Hi there,
By default, the lifetime of a certificate that is issued by a Stand-alone Certificate Authority CA is one year. After one year, the certificate expires and is not trusted for use. There may be situations when you have to override the default expiration date for certificates that are issued by an intermediate or an issuing CA.
Here is a link as well to dig more information regarding the certificate validity https://learn.microsoft.com/en-us/troubleshoot/windows-server/identity/change-certificates-expiration-date
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