We Can Help
You might also find your answer in the LastPass Enterprise Manual.
Can a user be added more than once to a Shared Folder?
Yes, a user can be added to a shared folder more than once in certain situations. If you add a user to a shared folder individually first, they can be added again if you add a user group that they are a part of to the same folder. This is not backwards compatible--if a user is added to a shared folder via a group first, they will no longer be available to be added individually. You can also add a user more than once by adding multiple user groups they are a part of.
In any case where a user is added more than once to a folder, the most restrictive settings take priority, so please be careful when adding a user to a folder more than once.