Facebook messenger reaction notification setting is missing from my app

Hi All,

My problem is that I did not receive reaction notification.

I try to switched this function on, so I opened a chat window clicked on settings -> notifications -> but I found only the Message Notifications switch button only, the Message reactions button is missing .
My girlfriend has the same phone (Xperia Z5 compact) with the same op system (Android 7.0) and she has Message reaction button. I tried to login to her phone with my account, but this function still missing. I guess maybe there is a problem with my fb account?

I know this is not a first world problem but I would like to know what is behind this strange issue.

Thank you for your answers.
Balázs