Hello Rob, 

As I can see you are referring to Event bookings per your screenshot (you mentioned appointments so I am not completely sure - Appointments inAmelia are for Services, they are in no connection to Events) - if you use Events, those are not the Zoom placeholders for Zoom for events, they are for Services. When you choose the correct notification and then open the Placeholders list you will see the placeholders depending on the notification chosen (whether it is for services or events) 

These are the placeholder for Zoom links for events:

1. %zoom_host_url_date% – this is the placeholder that you need to paste in employees’ event notifications if you want to show the url with date.
2. %zoom_host_url_date_time% – this is the placeholder that you need to paste in employees’ event notifications if you want to show the url with date and time
3. %zoom_join_url_date% – this is the placeholder that you need to paste in customers’ event notifications if you want to show the url with date.
4. %zoom_join_url_date_time% – this is the placeholder that you need to paste in customers’ event notifications if you want to show the url with date and time.

These are for services/appointments: 

1. %zoom_host_url% – this is the placeholder that you need to paste to employees’ appointment notifications.
2. %zoom_join_url% – this is the placeholder that you need to paste to customers’ appointment notifications.

And you can find them listed here.