I ran this command: certbot certonly --manual --preferred-challenges=dns --server=https://acme-staging-v02.api.letsencrypt.org/directory --agree-tos -d pinakis.co.in
It produced this output:
Challenge failed for domain pinakis.co.in
dns-01 challenge for pinakis.co.in
Cleaning up challenges
Some challenges have failed.
IMPORTANT NOTES:
The following errors were reported by the server:
Domain: pinakis.co.in
Type: dns
Detail: DNS problem: SERVFAIL looking up TXT for
_acme-challenge.pinakis.co.in - the domain's nameservers may be
malfunctioning
My web server is (include version): NA
The operating system my web server runs on is (include version): NA
My hosting provider, if applicable, is: GoDaddy - InfinityFree
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):
Yes
The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): certbot 0.40.0
Note that this is not limited to Let's Encrypt and not limited to the TXT record Let's Encrypt uses for the dns-01 challenge. All DNSSEC-enabled DNS resolvers will return SERVFAIL for lookups to your domain, so in essence all services through DNS are down for those users.
Note 2: is there a particular reason why you're using the manual plugin with the dns-01 challenge? You're not requesting a wildcard certificate, so why not use the http-01 challenge through the standalone plugin, if you don't have a webserver running yourself?