Forwarding RADIUS Authentication from NPS/Meraki

Hi all,

I have a Meraki AP that I've setup to authenticate with a NPS/Radius server.  I've got this setup correctly, however, once I've entered the username/password for my SSID, I'm then asked again for the username and password, once I try and access the internet, via the UTM.  Is there any way that this can be setup so that the RADIUS username/password can be forwarded to the UTM, as it's not too seamless to have to do it twice?

Thanks in advance.

Michael