Cisco 1200 AP

I have configured a Cisco 1200 AP for WPA2-PSK which is working with a wireless device able to connect OK. I have tried to add MAC authentication using the FreeRadius server, but have not been able to get it working. I can see from the FreeRadius log that the AP is sending the Access-Request packet and an Access-Accept response is being returned but the wireless device is unable to connect. Has anyone setup this configuration and got it working? Regards, John