Stream PS4 Twitch - comments chat on mobile?

I'm streaming from PS4 to Twitch and have linked the Twitch account to PS4.

I used to be able to see and answer the comments on another device, e.g. On my cell phone.

Somehow I can no longer do it. Does anyone know how this currently works?
I have the Twitch app on the iPhone.

It's easy with the Playstation 2nd Screen App.

This shows you as soon as you are on or streams the chat directly. Of course, you don't have all the features that you have in the normal Twitch app, but it is enough to read comments✌

Oh that sounds good! I tried that with the Twitch app and it just didn't work.