ALL: it only works with Microsoft Edge Browser on Mac. I downloaded and it works...
https://support.microsoft.com/en-ca/help/4501095/download-the-new-microsoft-edge-based-on-chromium
See: https://fujifilm-x.com/global/support/download/software/x-webcam/
macOS: Google Meet (Chrome/Edge*), Teams (Chrome/Edge*), Skype (Chrome/Edge*), Zoom (Chrome/Edge*), Messenger Rooms (Chrome/Edge*), LINE、OBS Studio *Chromium Edge