Just wanted to point out that Auracast will only be available on devices that have hardware that supports the Bluetooth LE Audio standard. These are: Galaxy S24 and S23, Z Fold and Z Flip 5 and 4, and A54 and M54 5G.
Samsung has announced a comprehensive audio upgrade for numerous products, ranging from Galaxy smartphones, tablets, Smart TVs, Galaxy Books to the Galaxy Buds2 Pro.