I successfully obtain a wildcard certificate for mftj.ca by running this command :
sudo certbot -d *.mftj.ca --manual --preferred-challenges dns certonly
I tried three times for the ptcs.app domain on the same server but it is not working :
sudo certbot -d *.ptcs.app --manual --preferred-challenges dns certonly
It produced this output:
Please deploy a DNS TXT record under the name
_acme-challenge.ptcs.app with the following value:
Before continuing, verify the record is deployed.
Press Enter to Continue
Waiting for verification...
Challenge failed for domain ptcs.app
dns-01 challenge for ptcs.app
Cleaning up challenges
Some challenges have failed.
The following errors were reported by the server:
Detail: DNS problem: NXDOMAIN looking up TXT for
_acme-challenge.ptcs.app - check that a DNS record exists for this
My web server is (include version): nginx 1.18.0
The operating system my web server runs on is (include version): ubuntu 20.10
I can login to a root shell on my machine (yes or no, or I don't know): yes
The version of my client is (e.g. output of
certbot --version or
certbot-auto --version if you're using Certbot): 1.7.0
Thank you for your help !