You see a cryptic 500 Internal Server Error that renders as "Access Denied" due to a custom error page.
The problem may be on the website owner's end. The page may have moved, or their security firewall (like Cloudflare or Akamai) may be mistakenly flagging legitimate users as bots. In this case, you will need to contact the company's web support directly.
Instead of a hard “Access Denied” generic message, return a with a custom explanation: “This sustainability report is temporarily unavailable. Please email sustainability@xxxx.com.au for a PDF copy.”
https://www.[domain].com.au/sustainability/fix
Rewrite the regex to be path-specific. Use RewriteCond to exclude the sustainability directory.