GPO other questions
make sure user not be member of loopback policy as in loopback policy it doesn’t effect user settings only computer policy will applicable. if he is member of gpo filter grp or not.
You may also want to check the computers event logs. If you find event ID 1085 then you may want to download the patch to fix this and reboot the computer.
By default, Software Installation, Scripts, and Folder Redirection will not process over a slow link