You’ll need a compatible device that runs Apple Intelligence, like an iPhone (15 Pro or newer), iPad (Mini A17 Pro or newer or an M-series chip), Mac (MacBook Neo or M-series chip), Apple Watch (Series 9 and Ultra 2 or newer), or Apple Vision Pro.
With macOS Golden Gate, Apple phased out several legacy features and services, cutting support for older devices and accessories. More cuts are coming in macOS 28 as Apple continues to root out lingering Intel features.