Remote VPN access with access control

I've just installed a two-station Orbi 770 in an environment that is 

1. remote from my office
2. requires using MAC-number based access control to allow only authorized users without constantly changing passwords.

On the Web interface, the access control section appears to give me what I need, and the VPN capability promises to give me access to the web admin interface remotely. Indeed, it does--as long as access control is turned off. But then, of course, I'm not limiting access to the MAC numbers in my list. But if I turn it access control on, my VPN session is blocked. This is not surprising, because VPN doesn't pass on the MAC number of my home machine, so even if I authorize access for that MAC number, it doesn't recognize me.

Is there some way to tell the system to grant access to a VPN channel, even while access control is on?