Looking at the Jitsi Meet script:
https://github.com/jitsi/jitsi-meet/blob/master/resources/install-letsencrypt-cert.sh
It seems like it installs certbot and sets up a cronjob at /etc/cron.weekly/letsencrypt-renew which should log to /var/log/le-renew.log
Can you see if you have a /var/log/le-renew.log file on your server, and what it contains?