Hi @tigco,
To check if the cronjob (and cron) works, you could change the pattern so it executes each hour pipe the output to a file.
0 0 1 * * sudo /opt/bitnami/letsencrypt/lego --path /opt/bitnami/letsencrypt --email="EMAIL" --http --http-timeout 30 --http.webroot /opt/bitnami/apps/letsencrypt --domains=DOMAIN renew > /tmp/lego-cron-output
Then you can check the output after an hour.
cat /tmp/lego-cron-output
Regards,
Michiel