Apache ProxyPassReverse: Certbot returns Invalid response (403) when trying to renew or getting new certificates

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Thanks for the reply.

I've edited the first conf file to be:

<VirtualHost *:80>
        ServerName myaccounts.live
        DocumentRoot /var/www/html
        #skip challenge requests and
        <LocationMatch "^/(?!\.well-known)">
                #send all other requests to HTTPS
                RewriteEngine On
                RewriteCond %{HTTPS} !=on
                RewriteRule ^/?(.*) https://%{SERVER_NAME}/$1
        </LocationMatch>
</VirtualHost>

And ran the commands:

$ sudo systemctl stop apache2
$ sudo certbot certonly --webroot --dry-run --test-cert --renew-by-default --agree-tos -d myaccounts.live

But I've got this result:

Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator webroot, Installer None
Renewing an existing certificate
Performing the following challenges:
http-01 challenge for myaccounts.live
Input the webroot for myaccounts.live: (Enter 'c' to cancel): /var/www/html/
Waiting for verification...
Challenge failed for domain myaccounts.live
http-01 challenge for myaccounts.live
Cleaning up challenges
Some challenges have failed.

IMPORTANT NOTES:
 - The following errors were reported by the server:

   Domain: myaccounts.live
   Type:   connection
   Detail: 162.250.127.130: Fetching
   http://myaccounts.live/.well-known/acme-challenge/2BjHucgDr0gwqjJ_U_VjLV8_p613Ec6wZ1_V-zxdClo:
   Connection refused

   To fix these errors, please make sure that your domain name was
   entered correctly and the DNS A/AAAA record(s) for that domain
   contain(s) the right IP address. Additionally, please check that
   your computer has a publicly routable IP address and that no
   firewalls are preventing the server from communicating with the
   client. If you're using the webroot plugin, you should also verify
   that you are serving files from the webroot path you provided.

And you can see there is a folder for the webroot:

$ ls -al /var/www/html/
total 20
drwxr-xr-x 2 www-data www-data  4096 May 12 07:46 .
drwxr-xr-x 3 root     root      4096 May  1 22:04 ..
-rw-r--r-- 1 www-data www-data 10918 May  1 22:04 index.html