Getting Error While Processing sslforfree.com Certificate

[mukhlisurrehman]

I got the following error while getting the ssl certificate.
Domain “www.vustudentshub.epizy.com” challenge3 failed. Response from “https://acme-v02.api.letsencrypt.org/acme/challenge/srZCb4c1CLGe2Fn37D0sgyVjFzV9tUrLLZji8XIrApo/13533556059” was:

Warning: Your verification URL is not returning the correct contents to our verification servers. The URL looks like it is blocking bots and which inadvertently blocks our servers from receiving the correct content. Contact your host, a professional developer or admin for further help with fixing it.

[Oxy]

HI

1. problem - you have subdomain not domain

2. another reason why it does not work
   https://infinityfree.net/support/cannot-use-or-have-problems-using-lets-encrypt-or-sslforfreecom/

basically you need a domain not subdomain
how to get a free domain? here https://www.freenom.com/en/index.html?lang=en

then use cloudflare because it gives you free ssl (https) plus other stuff
https://www.cloudflare.com/

also read this https://infinityfree.net/support/add-your-own-domain/