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To generate certificate (or renew)

sudo ~ec2-user/py3env/bin/certbot certonly --dns-route53 --expand --agree-tos --text --non-interactive -d seistech.nz -d *.seistech.nz

Or simply 

sudo ~ec2-user/py3env/bin/certbot renew

Make sure the correct certificate is used in /etc/nginx/nginx.conf. Restart the Nginx service

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