NSW Health has cancelled appointments at the Belmont vaccination hub as the government redirects vaccines to western Sydney for high school students.
People with bookings in the coming days have started receiving text messages notifying them that their appointment has been cancelled.
"We will initially cancel your current booking but will send you a priority booking code in the coming days to enable a rebook at a later date," one of the messages seen by the Newcastle Herald says.
"Pfizer vaccines are being redirected to assist in vaccinating Year 12 students in south-western and western Sydney to help them return to face to face teaching."
It is not yet known how many bookings have been affected.
Lake Macquarie MP Greg Piper said "a number of people" had contacted him on Saturday about the cancellations.
"I'm as much in the dark as everyone else, and as angry as everyone else," he said.
"I'm chasing Hunter Health for some sort of explanation as we'd been told that existing bookings would not be affected by the redirection of vaccines to Sydney."
Hunter New England Health is expected to released a statement shortly.
HNEH Local Health District CEO Michael DiRienzo said it would be able to deliver 20,000 vaccines a week.