Firebase - is a new Registration Token needed for each platform of an app ( e.g. android + web ) that a single user uses?

Is a new Registration Token needed for every platform of an app that a user uses?

For example, I login to Facebook from my phone's app and I also access it from the web. Would this require a single Registration token, shared by the different platforms, or would every platform still require its individual Registration token for a given user. Hence, a user may have multiple Registration tokens being used at the same time if they access the app from several different platforms?