Ensure you are using https:// . Some corporate sustainability portals have retired http links, and a mismatch can trigger a security block.
Sustainability pages are often moved or archived when a new annual report is released. If you are clicking a link from an old PDF or a bookmarked search result, the "Access Denied" might actually be a misconfigured redirect for a page that no longer exists. access denied https wwwxxxxcomau sustainability fix
If you share the (or a hint of the company name), I can give a more targeted answer. Otherwise, the above is the solid piece you can act on. Ensure you are using https://