Why do I have failed files in the scan details of the Office 365 Securlet?
Office 365 Securlet
The failed column represents:
The failed files column will fluctuate with a sudden increase of new files to be scanned or as files are deleted or modified.
If you find a large number of failed files reported that have not cleared up over time, create a support ticket asking for details regarding these files such as:
A re-scan may not touch these files as only exposed files will be re-scanned and only for 30 days for email.
A feature has been requested to break down failed files in greater detail.