cetbot DNS A/AAAA record error

So I followed this tutorial(https://certbot.eff.org/lets-encrypt/ubuntufocal-nginx.html) to install certbot and then I followed the instructions here(https://gist.github.com/belst/ff36c5f3883f7bf9b06c379d0a7bed9e) to make my certificate.

The command I used was:

sudo certbot certonly --webroot -w /var/www/letsencrypt -d your-domain.tld -d www.your-domain.tld

I changed www.your-domain.tld to be my domain. I ended up getting an error that said,

 To fix these errors, please make sure that your domain name was
   entered correctly and the DNS A/AAAA record(s) for that domain
   contain(s) the right IP address.

However, I checked to make sure that my domain name was entered correctly (mydomain.com and www.mydomain.com), and I have both DNS A and AAAA records set up for my domain. I have checked that my IP address of my droplet is correctly specified in these records. I’m not exactly sure what it is that is going wrong. Any help would be much appreciated. Thank you.

If you need anymore information please let me know.