Hidden Drive Letters

[TLARWise]

We started using a new Intune based system this term, however we are having an issue where drives E and F are hidden when USB drives are connected to the client devices.  If you look in Disk Management the drives are allocated to the drive letters and I am able to access them by typing in the drive letter in the address bar of File Explorer.  I have checked the NoDrives option in the registry (HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer, same for LOCAL_MACHINE) and there is an entry but this is listed as 4 which should only hide the C drive, which is expected.  Is anyone aware of any other settings/third party apps that have the ability to hide drives?  We do use IAMS Cloud Drive Mapper to map OneDrive/Sharepoint folders but no entries are configured to use drives E and F, is there another setting in this app that could result in hidden drives that we may have missed?

[TLARWise]

Just to update this for anyone who has the same issue in the future.  It turns out that the company who setup our Intune policies configured this value using a PowerShell script, however they accidentally created the 'NoDrives' registry entry as a string value instead of a binary dword value.