March 6, 2024
                
            
            
            
        
    
                1:52 p.m.
            
        Thank you all for responding so quickly.
Changing the Apache configuration fixed the problem. Here is the final result:
<IfModule mod_proxy.c>
  ProxyPreserveHost On
  ProxyPass "/mailman3" "http://127.0.0.1:8000/mailman3"
  ProxyPass "/archives" "http://127.0.0.1:8000/archives"
  ProxyPass "/accounts" "http://127.0.0.1:8000/accounts"
  ProxyPass "/admin" "http://127.0.0.1:8000/admin"
  ProxyPass "/user-profile" "http://127.0.0.1:8000/user-profile"
  ProxyPass "/postorius" "http://127.0.0.1:8000/postorius"
  ProxyPass "/hyperkitty" "http://127.0.0.1:8000/hyperkitty"
</IfModule>
Thank you again!