I thought this message from Del. Ariana Kelly was helpful in explaining what is going on and options for getting a vaccine if you are eligible. You can get a vaccine from a hospital but you have to register with them directly, not with the county health department.
https://myemail.constantcontact.com/Who-s-the-boss---Answers-to-your-COVID-19-vaccination-questions.html?soid=1134728218909&aid=ClHZR0qaKxI