This is just a guess, but if thats what they told you, I'd guess they are reserving it for people with more serious at-risk health conditions (cancer, chronic kidney disease, organ transplant, and so on) who are still being managed as outpatients.
Not sure if this service is open to you now, but you could try scheduling an appointment with the general internal medicine outpatient service at whichever hospital supposedly has it in stock. If you can get a telehealth appointment with them they might be able to order the IV infusion.
One important word of caution - depending on your health coverage, the hospital, and a bunch of other factors I am probably ignorant of, there is a very real chance this could be very expensive. you might be able to get an out of pocket cost estimate but how your insurance decides is anyone's guess (will also depend on how the hospital bills it to some degree). Just want to put that out there so you aren't shocked if you end up paying a lot of money for a treatment that may or may not provide you with a noticeable benefit.