Radius configuration is not active

Despite configuration of Radius servers, no radius request is done from the SBC and login of local accounts is possible. The command "show radius authentication" shows all zeros on both radius servers. No communication attempt towards radius seems to be made.

Ping shows that we have connectivity over wancom0 through default gateway.

In log.authd we can see a warning saying that "Adding the Radius Server to management-servers for compatibility". But no communication attempt to any radius server.

We have also tried a reboot, but no difference.

Do we have to do something more than add the radius server into the authentication configuration section?