In order for me to be able to assist you to the best of my abilities, could please be so kind as to share with me a little more detail about the issue you came across including:
1- The name of the practice you are trying to book the appointment with
2- The name of the doctor you are trying to book the appointment with
2- Most importantly, the exact error message you see when you try to book the appointment
As soon as I receive the above information, I will be sure to look into this right away and update you about my findings.
Customer support service by UserEcho