A handful of older iPhones and iPads, which were previously thought to work with Spatial Audio, apparently do not. They are: the iPhone XR, iPad Mini 5, iPad Air 3 and 6th to 8th generation iPads.
As the updated Apple support document confirms, playing Spatial Audio out loud requires, "the speakers built into an iPhone XS or later (except iPhone SE), 12.9-inch iPad Pro (3rd generation or later), 11-inch iPad Pro or iPad Air (4th generation)".
End of story? Not quite. Apple Music isn't singing from the same hymn sheet. The Apple Music website still says that Spatial Audio works with the iPhone XR's built-in speakers.
To add to the confusion, MacRumours reports that a number of iPhone XR users claim to have been able to use Spatial Audio on their devices in automatic mode, meaning that the iPhone XR might support Spatial Audio in an unofficial capacity, even if the iPad Mini 5, iPad Air 3, and 6th to 8th-generation iPads do not.
Prefer Android to iOS? Apple recently rolled out Spatial Audio and lossless support for the Android version of Apple Music. Although we wouldn't expect Spatial Audio support on specific Android phones to be any clearer...
What is Apple Spatial Audio? And how do you get it?