AT&T gave me the network address as my gateway address

Just switched over to AT&T Business and the IP address they gave me for the gateway is the network address. The Internet connection works, but my router doesn't like it at all and is throwing errors about invalid gateway address. I have been having issues with my client VPN connections refusing connection and I want to rule this out as the reason. I have an open ticket with AT&T about this. Has anyone else encountered this and if so, are you having any issues with VPN connectivity for your clients?