Bad Login Notifications


I am relatively new to Nextcloud. I have set up a functioning Nextcloud server using ubuntu 18.04. Recently I have seen that when I get a bad login that the only place that I see a notification, is when I use the ‘mail’ command at the CLI. I have an admin email that I have tested and works correctly, why is it that the CLI is the only place that I get these notifications?

Thank you,