Reject authorization if realm is not found

Dear, I need your help regarding one challenge that I have. I created several realms on my radius. And now I am testing establishing of session with account with realm that is not defined on radius (In proxy.conf) How can I reject this type of the authorization if I am getting this type of message. It is in authorize section: authorize { (0) [digest] = noop (0) suffix: Checking for suffix after "@" (0) suffix: Looking up realm "example.com" for User-Name = test@example.com <mailto:test@example.com> (0) suffix: No such realm "example.com" (0) [suffix] = noop I want here to reject authorization 😊 Thanks in advance for your response, Filip