The 28-year-old had registered early and was online in the morning in an effort to make the booking, but he said the experience was like trying to get a ticket for the Splendour in the Grass music festival.

"All of a sudden the floodgates are open, and you've got a short period of time to secure your Splendour in the Grass ticket and within 35 minutes of record sales, Splendour in the Grass has sold out," Mr McGrath Weber said.

"It was a similar situation, just to be able to get a vaccine that will enable you one day to go Splendour in the Grass again."

But after a website crash and a long time spent in the phone queue all for an appointment in early November, Mr McGrath Weber changed his mind.

He booked in for an AstraZeneca shot with his GP next week and registered his interest on Pfizer cancellation lists.

Mr McGrath Weber said the wait time for a Pfizer appointment had encouraged him to consider the AstraZeneca option, even though Pfizer had been his first preference.

"People who are quite diligent and are active and actively seeking to get these appointments, jump on the computer and actually can't secure a spot until November - it doesn't really feel you with confidence that you are going to be protected and whether you might actually miss out on opportunities that that other people who are fully vaccinated might be able to experience," he said.

Mr McGrath Weber said the ACT government had done a good job of ensuring people could access the vaccine, but the problem stemmed from supply constraints at the federal level.

He said he did not want younger people left behind if the country began to ease restrictions before the cohort could be vaccinated.

"I think there's a real passion for it there and everyone really wants to get vaccinated within my friendship group and people I speak to, but it's quite difficult with a lot of these barriers put in place," Mr McGrath Weber said.

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Canberrans aged 16 to 29 booked a total of 16,210 first-dose Pfizer appointments on Wednesday, the first day the cohort was eligible.

More than 17,700 total appointments were made on Wednesday.

Close to 60 per cent in the cohort have either now had one dose of a COVID-19 vaccine or are booked to do so, taking into account those who had received the jab in earlier phases of the rollout.

Nearly 67 per cent of Canberrans aged 16 and over have had at least one dose, while 43.86 per cent have had both.

Canberrans aged 75 to 79 have become the first cohort in Australia to be 80 per cent fully vaccinated.

Chief Minister Andrew Barr again encouraged young people in Canberra to consider getting an AstraZeneca vaccine.

"We desperately wish we had more Pfizer vaccines but we don't. If you don't get your first dose of Pfizer until October, then it's a further three weeks until you can get your second dose. And then a further two weeks until you are effectively vaccinated," Mr Barr said.

"This means for people in this aged cohort, you're facing two to three months without vaccine protection. A single dose of vaccine protection does provide you with a much greater degree of protection than being unvaccinated."

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