Certificate with loadbalancer on OVH

? ? ?

So you still get:

I believe you are still not correctly aligning the --webroot used with the challenge path used...

This
location /.well-known
root /usr/share/nginx/html
will become this
/usr/share/nginx/html/acme-challenge/{AUTH-TOKEN-FILE}

While this
–webroot -w /usr/share/nginx/html
will become this
/usr/share/nginx/html/.well-known/acme-challenge/{AUTH-TOKEN-FILE}