This issue occurs in the NTFS Security module while granting folder permissions.
Domain A and Domain B have a bidirectional trust. Logging in to a computer in Domain A with an account from Domain B. When trying to grant permissions by adding a user/group from the LOGON domain, the following message displays, "Please ensure you have selected a valid user."
WORKAROUND
See solution article Granting folder permissions returns Error: Please ensure you have selected a valid user
STATUS
Fixed in latest release of Security Explorer, which can be downloaded from here.
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