Hi,
If you would like to connect to work over the VPN you are best asking your IT department, they will be better suited to advise:
1. If your account allows you to connect via the VPN
2. The connection method required to do this task
Point 2 is very important as you may just use your windows credentials to connect or you may have something called 2 factor authentication which means you will have something like a soft token that you will need to enter too but this will need configuring.
Regards,
Jamie