We are on Lightsail and the following worked for us.
To check for the account ID:
sudo nano /opt/bitnami/letsencrypt/accounts/acmev02.api.letsencrypt.org/email@domain.com/account.json
*replace email address
To renew
1. sudo /opt/bitnami/ctlscript.sh stop
2. sudo /opt/bitnami/letsencrypt/lego --tls --email=email@domain.com --domains=domain.com --path="/opt/bitnami/letsencrypt" renew --days 90
3. sudo /opt/bitnami/ctlscript.sh start
*replace email address and domain.com