Hello @rohigot, welcome to the Let's Encrypt community.
Here is a list of issued certificates crt.sh | phew.pelm.shop, the latest being 2022-12-26.
However Let's Debug is showing an ERROR, results here https://letsdebug.net/phew.pelm.shop/1327327
And here is what I get with curl
$ curl -Ii http://phew.pelm.shop/.well-known/acme-challenge/testfile
HTTP/1.1 404 Not Found
Server: nginx/1.18.0 (Ubuntu)
Date: Sun, 08 Jan 2023 00:36:09 GMT
Content-Type: text/html
Content-Length: 162
Connection: keep-alive
That is an old version of Certbot; check here Certbot 2.1.0 Release