FaceTime web requirements
When you receive a link to a FaceTime call on your Mac, iPhone or iPad, you join using the FaceTime app. On other devices, you join the call from your browser (no login is necessary). An Android or Windows device must have the following:
A browser that supports WebRTC (such as the latest version of Google Chrome or Microsoft Edge)
An internet connection
A built-in or connected microphone; for FaceTime video calls, you also need a built-in or connected camera (H.264 video encoding support required)