Hi there rasg
my friend has the hearing aid option on his AirPods Pro 2 usbc ,
I asked him but he really did not know how he got it ,even though we are in the same country and using the same carrier network ,so tomorrow I’ll be crossing the border from my country into Spain ,so I will try it out once I start roaming into their network provider ,
buy the way my friend is still using the hearing aid in our country and has been working since
They will work until he next updates them. You haven’t mentioned which country you live in but if it still doesn't have approval when they next update, the hearing aid feature will disappear. I suggest that he switches auto update off. IOS 18.4 is in beta at the moment...