I just downloaded and used Zoom for a virtual appointment. I downloaded the app but didn't have to use any FB credentials to log just the information my provider set up for the meeting.
Only issue I had with it was my provider could not see me, turns out video controls in my machine overrode any controls from the application. Usually I have the option for apps to access the camera turned off. Looks like I will have to turn it on for the next appointment. Plan to turn on just before and reset to off immediately afterward. I use MS Teams for other virtual meetings.