Forum Discussion
Cloud App Security - Admin Quarantine with SharePoint
Documentation has been updated.
Cloud App Security only detects new SharePoint and OneDrive folders, including if they are set as the admin quarantine folder, after some file activity has been performed in them.
Protect files with Cloud App Security admin quarantine | Microsoft Docs
UPDATE: Found this info in a previous thread 
MCAS detects new folders only after some file activity has been performed in them.
I suggest you upload a single file to the new folder, which will cause MCAS to pick it up.
Questions
- Could this be some type of indexing delay (within MCAS or SpO/O365 Graph, etc.) that follows initial service integration (AIP/O365 Connector - Files)?
- If so, could the Docs be updated to set a reasonable expectation for how long it may take once a new SpO site is created until it's available to actually assign to the Admin Quarantine folder location (via search results)? - The info above would be helpful to include in the Docs article on Admin Quarantine.
- Is there any way to speed up the process? - Yes, see above.
Microsoft
Documentation has been updated.
Cloud App Security only detects new SharePoint and OneDrive folders, including if they are set as the admin quarantine folder, after some file activity has been performed in them.
Protect files with Cloud App Security admin quarantine | Microsoft Docs