Let's try to renew the certificates manually so we obtain more information about the issue. As you can see in the cron file, there is an automatic job configure there to renew the certificates.
sudo crontab -l -u bitnami
Can you run that command in the terminal?
sudo /opt/bitnami/letsencrypt/lego --path /opt/bitnami/letsencrypt --email="YOUR_MAIL" --http --http-timeout 30 --http.webroot /opt/bitnami/apps/letsencrypt --domains=YOUR_DOMAIN.com renew && sudo /opt/bitnami/apache2/bin/httpd -f /opt/bitnami/apache2/conf/httpd.conf -k graceful
Please run the exact command you have in the cron file and share the output with us
If that command didn't succeed, can you try with the following commands?
sudo /opt/bitnami/ctlscript.sh stop apache
sudo /opt/bitnami/letsencrypt/lego --path /opt/bitnami/letsencrypt --email="YOUR_MAIL" --http --domains=YOUR_DOMAIN.com renew
sudo /opt/bitnami/ctlscript.sh start apache
Note that I removed the http.timeout option and the http.webroot one
PS: It's really important that you share the output of both methods here so we can investigate the issue.