As Apple rolled out an update for Apple Music on Android, the company also updated a support document that showed which Apple devices can support Spatial Audio playback. And it looks like some of the older devices won't be getting the feature.
The new change states that the "built-in speakers on an iPhone XS or later (except iPhone SE), iPad Pro 12.9-inch (3rd generation or later), iPad Pro 11-inch, or iPad Air (4th generation)" will support Spatial Audio. This means the iPad mini 5, the iPhone XR, or the standard iPad 6, iPad 7, or iPad 8.
Source: 9to5Mac