Replace xxxx with the actual domain name, and I can help diagnose the exact error code (403, 1020, 404, etc.) and find the working sustainability page for you.
Reproduce and test
An "Access Denied" or 403 Forbidden error on a sustainability page often indicates a server-side block, such as a WAF, regional restriction, or IP restriction. Troubleshooting steps include clearing browser cache, disabling VPNs, or using private browsing to resolve potential security conflicts. For a detailed guide on fixing this error, refer to GeeksforGeeks 403 Forbidden - HTTP - MDN Web Docs - Mozilla access denied https wwwxxxxcomau sustainability