Logon failure: the user has not been granted the requested logon type in the computer

Using SGN Client 5.50.1 - After successfully logging into the SGN POA, we were getting this error from the SGN Credential Provider in Windows 7: "Logon failure: the user has not been granted the requested logon type in the computer". This error only occurred on Windows 7 machines when logging in as a non-administrator. We have pretty strict GPO settings so they figured out this the setting we needed to change in our GPO:  "Access this computer from the network" needs to be enabled for "Everyone". We had it set to only Administrators. Made the GPO change and it started working for all users.