security/acme-client: issuer key not existed in cacert_details dictionary
https://github.com/opnsense/plugins/blob/97603fc29b18f724a7b812ae8c37f2965cb2c363/security/acme-client/src/opnsense/mvc/app/library/OPNsense/AcmeClient/LeCertificate.php#L171
I got NULL value with $cacrt_details['issuer'] and exception stop the cert issue process
Maybe following update can solve this problem?
$cacrt_issuer = implode(",", $cacrt_details['issuer']??[]);
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Please provide more context/details. Which CA are you using, how is your ACME plugin configured?