Cannot allow access to acme-challenge, tried everything

Hi everyone,

I am desperate and have tried for hours and days to make it work but still nothing.
I wanted to use Let's Encrypt with my wordpress ubuntu server, and for that I need to allow .well-known to do the acme-challenge. I have tried everything, every combination possible, every guide on the internet, and still cannot allow access to .well-known. I don't know what to do anymore.
I added rules to locations.conf, to each server-available file, every possible rule combination, redirected to another folder for /.well-known/acme-challenge following some guides to centralize licenses, still nothing. What am I missing?
BTW, I used EasyEngine for the installation, but that should not change anything. I actually used a guide on EE in the beginning which also didn't work, and then tried everything else. What else should I check, what other thing could be preventing me?
Another thing, I have a VM running ubuntu on my pc for the server, and I am using No-IP for a dyndns. Still that should not change anything, because when I try to open .well-known, I get a Forbidden message from Nginx, so it does reach the server, but Nginx doesn't allow. Help!