OnUserSubscribed not called

edited March 2020 in Photon Chat
Hi, when ever an user subscribe a channel OnUserSubscribed does not get called.

User A subscribe the Channel "Default"
User B subscribe the Channel "Default"

Now I except on User A script the OnUserSubscribed would get called but it doesn't get called.

What I want to achieve is to add all new user to a list to have a list of all user in that channel. If there is already a list by default so I can skip above and use the list.

The Photon Chat Demo in Unity do not call OnUserSubscribed as well.
Everything else works well like sending a chat message.