Useless scheduling

Every time I use this app to schedule pediatric appointments there is a problem. I go through selecting the type of appointment (ie well-child, school physical, etc), I choose an available time with the kids’ provider, and it tells me I’ve successfully scheduled their appointment. Then the pediatric office calls me and leaves grumpy messages on my voicemail and MyUPMC informing me that “there’s not enough time for the provider to see my child.” Then they cancel the appointment. Obviously this renders the on-line scheduling aspect utterly pointless/useless.