Can no longer invite or join friends on calls

A couple of days ago after my headset updated, I no longer had the option to invite friends to calls, nor can I join calls or even see when my friends are online. When I go on to ‘People’ the option to invite/chat isn’t there and instead it takes me to the Shop! 
I tried asking a friend using the app chat on my iOS to send me an invite, which they did but when I clicked on it and tried to launch on to the VR, nothing came through on the headset to allow me to do it.

Any ideas would be very much welcomed, thanks