Talk notifications

Hey. I only use Nextcloud Talk on browsers, but I can’t make notifications work. Even when 2 users are logged in at the time, when I try to start a videocall or even a simple text chat, there’s no notification. I thought the browser tab would blink or something.

Is this the normal behavior?

Nextcloud version (eg, 12.0.2) : 16.0.1
Operating system and version (eg, Ubuntu 17.04) : Ubuntu 18.04
Apache or nginx version (eg, Apache 2.4.25) : Apache 2.4
PHP version (eg, 7.1) : 7.2