I have been trying each day since a month now, at different times. Couple days back I was able to see many dates from 2024, the earliest being Feb 20, 2024 in Vancouver, then one in April in Toronto. Each time I was able to select a date and time. But then, each time I got the error - Your appointment could not be rescheduled. Please make a valid selection. I think I was pretty quick with the selection. Looks like my internet was not great to send the information back to their server
It is heartbreaking to see the error after the efforts you put in each day. It's not worth it. I think they have a way of knowing if someone is attempting multiple times and they are putting a soft block on their IDs preventing rescheduling. Let me know if anyone is able to advance their appointment recently.