Butons and UI that don’t work with Unity and Photon

Hey, i use Unity and I have integrated Photon in my project.
But i have a problem: when I load the server scene, it’s impossible to use the buttons that are in the scene.
Informations: i create a room wtih c# and I load a scene with « void OnCreatedRoom() »
The scene loaded don’t contain any Photon View and i have a button and when i click it there is a script with a fonction public void that is supposed to be activated. But a simple Debug.Log in this public void doesn’t appear in the console, so i try with an other button but they don’t work. So i tried with an inputfield but it is already not interactable.