Hello, thank you for reaching out to Microsoft Q&A.
It can be a temporary server issue on Microsoft's end.
Try a different web browser, such as Chrome or Brave, and see if you can download the Windows 11 ISO file on your device.
Or use an incognito tab to download the ISO file- https://www.microsoft.com/en-us/software-download/windows11
If you're still having issues, you can click the link below to download the ISO file.
Note -
Links are valid for 24 hours from the time of creation.
Links expire: 2025-08-12T08:07:52.1527347Z UTC
Let me know if you still need more help.