No Calendar Button on MSFT Teams

[JTang]

Hi all, 

I couldn't find the calendar button on my Teams (screenshot attached below), does anyone know the reason? I would need this to schedule a call within the team. 

Much appreciated. 

[#2]

Do you have exchange online or on premises exchange? hybrid setup?

Adam

[#3]

Hi Adam, I am using school email for this, which I do believe is MSFT exchange.