User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:87.0) Gecko/20100101 Firefox/87.0

Steps to reproduce:

I followed an official Mozilla guide to enable encrypted SNI on Firefox Nightly. I'm pretty sure that I followed the procedures thoroughly.

Guides I followed ~
https://blog.mozilla.org/security/2018/10/18/encrypted-sni-comes-to-firefox-nightly/
https://blog.cloudflare.com/encrypt-that-sni-firefox-edition/

Actual results:

It didn't work. Tried testing using https://www.encryptedsni.com, but it tells encrypted SNI isn't enabled yet.

Expected results:

As I'm sure I followed the guide correctly, it should've worked. Note that, I'm a tech geek myself, so I don't think I could overlook something important while doing these stuffs or make an easy mistake.