creating users to remote in


I'm new to Sophos UTM 9 and having trouble creating users to be able remote into the network from the outside.  I've created a user and set authentication to Local.  I'm on a Mac so I'm trying to use L2TP over IPsec.  Also will need to configure for Windows users as well.  When I try to log into the Sophos page with the user credentials I"m not allowed.  The admin works fine.  I'm taking over as the IT person at this company so this has already been setup.  Unfortunately the older IT person is not available.  Any documentation or help would be appreciative.