W3CIISLog query no longer returning results

Hi,

I wonder if you can help. We have a problem where IIS Logs have stopped appearing in Log Analytics. The query I am running to try and view data is:

W3CIISLog

I can confirm that the VM is connected with:

Heartbeat

| summarize arg_max(TimeGenerated, *) by Computer

W3C IIS Logs are being generated on the VM when I look in Windows Explorer.

Capturing the logs has been enabled in:

Log Analytics workspace (Advanced Settings > Data > IIS Logs).

Does anyone have any suggestions what else I can check? As I say this was working previously. This is our test environment, I have the same setup with the live servers and they are still working fine.

Thank you in advance of any suggestions.

azure monitor

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W3CIISLog query no longer returning results