Have real domain and proper dns but challenge failed

[mchan]

Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. https://crt.sh/?q=example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My domain is: www.rdcwellness.ca

I ran this command:
certbot install --nginx …-d rdcwellness.ca -d www.rdcwellness.ca
It produced this output:
challenge failed no dns …
My web server is (include version):Ubuntu 18.04 LTS

The operating system my web server runs on is (include version):
Ubuntu

My hosting provider, if applicable, is: Selfhost

I can login to a root shell on my machine (yes or no, or I don’t know):
yes
I’m using a control panel to manage my site (no, or provide the name and version of the control panel):

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you’re using Certbot):
The latest

[9peppe]

@mchan

-d rdcwellness.ca -d www.rdcwellness.ca

You have an A record for the first but not for the second name. You should add one.

And you should also decide which of those names is your main name, and redirect the other towards it.