Just checking - do you have Nexia or Jabra EP20 hearing aids? Anything older than that does not support Auracast.
16_2_1 is a mandatory codec, and all Auracast devices ““should”” support. Although 24_2_1 is optional, it’s supported by most, if not all, Auracast capable hearing aids. For 48K streams, they are really for main stream Bluetooth audio devices and not for hearing aids.