At this point, my understanding is that Evusheld was distributed to the states. The states then pass the medication on to infusion centers based on Rx orders from doctors (who are qualified to assert that X person is properly immunocompromised). The infusion center I went to (in a hospital) had received 15 Rx and patients for the shots, entirely since the med was first distributed. They said they have no problem accessing the medication and that they have been surprised that more doctors/patients are not requesting the protocol.
No matter what any given hospital/medical center says to patients, the doctors have had to struggle with their own beliefs about this medication, their own prejudices and worries about rejection of organs with stronger immune responses etc. I can say that it took several months of being a very squeaky wheel to get my medical team to send the Rx out. I heard lots of reasons why I would not be able to get the medication from them - mostly having to do with not being a recent transplant recipient. Then suddenly, the Rx was sent, the infusion center received, the shots scheduled and I walked out the door with two bandaids on my glutes.