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Hello,
This usually happens when your domain name is not pointing to your server.
In order for Let’s Encrypt to be able to validate your domain name, you need to have your A record set to point to the server IP address first before running the certbot command.
Here is how to add new DNS records:
https://docs.digitalocean.com/products/networking/dns/how-to/manage-records/
Hope that this helps!
Best,
Bobby