When I got to the pharmacy I was sent to by the .gov website, I at first couldn’t find my insurance card in my bag, and they weren’t going to give me the shot, even though the .gov site said it wasn’t needed.
And even though I had entered all the correct insurance information asked on the website form in order to book the appointment.
Eventually I found my old card and it had enough of the right information (prescription bin, specifically) that they were able to bill my insurance.
So, if you don’t have insurance, be sure that’s known when you book the appointment. If you do, bring your card.
I also had 4 appointments cancelled because they were out of vaccine. Even the tech who was only able to give me my flu shot was upset, because she and her extended family were planning on getting their Covid shots and couldn’t, so we bonded over our distress.