Required storage permissions

Profile Containers store user information in VHD(X) files. These files are stored in a network location. Profile Containers and Office Containers can automatically create the folders and files needed. To avoid security issues, user permissions must be created to allow users to create and use a profile, while not allowing access to other users’ profiles.

Per FSLogix documentation (https://docs.microsoft.com/en-us/fslogix/configure-per-user-per-group-ht), the following is recommended:

User account	Folder	Permissions
Users	This Folder Only	Modify
Creator/Owner	Subfolders and Files Only	Modify
Administrator (optional)	This Folder, Subfolders and Files	Full Control