As I was following the tutorial found here: https://www.digitalocean.com/community/tutorials/how-to-secure-nginx-with-let-s-encrypt-on-ubuntu-20-04 in order to get my SSL certificate.
On step 4 I am asked to run the following command
sudo certbot --nginx -d example.com -d www.example.com with my domains which are working, I keep getting the following error: No valid IP addresses found for m**.ca (my domain)**. I waited the 48 hours as instructed by Google domains after changing name servers and keep getting the same issue.
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Is it really domain m.ca ? I tried few whois lookup web sites and got the same result - domain has not got an owner. In such case, there is no chance to get a certificate for it. But, if you put m.ca just as an example of your domain, then find out what https://letsdebug.net/ says when you enter your actual domain there.