Unfortunately, we don’t have access to backend logs for Microsoft’s Office Viewer service, as that viewer is entirely operated by Microsoft. The error page you’re seeing is generated by them.
There is a strong possibility that the issue may be caused by IP restrictions:
– This can happen if your live site has country-based access rules enabled, for example, restricting access to only certain countries or blocking specific IP ranges.Could you please confirm if such restrictions are in place? If so, we suggest temporarily disabling them and testing the preview again. It’s possible that these restrictions are preventing Microsoft’s service from accessing the file.
– Microsoft maintains a list of IP addresses used by Office 365, including those for the Office Online services that power document previews. Please ensure that connectivity to these domains and IP ranges is not being blocked. Pay a visit here for more information.
We hope this helps resolve the issue.
