Hello Eric,
For clarification, is the subnet to your client VPN different from the local subnet on the Meraki GO router?
Are you able to ping the GX50's local IP address on that VLAN interface?
Also, often times a server's local firewall (the firewall settings of the server itself) is set to block traffic sourcing from a different subnet by default. Can you verify that the server's local firewall settings are allowing traffic from a different subnet?
Best Regards,
.ılı.ılı. Tony N.
Cisco Meraki Technical Support