How to not be able to use Spotify on a child’s Apple Watch.

When an Apple Watch is set up for a child through Family Setup, it does not pair with an iPhone in the traditional sense, where all functionalities, including streaming from phone apps to the watch, are available. Instead, it's managed remotely through the adult's iPhone, which restricts certain capabilities, such as direct streaming from the iPhone's apps to the watch.

For Spotify specifically, the app typically requires a connection to an iPhone to stream music directly to the Apple Watch. Given the constraints of Family Setup, where the child's watch is not fully paired with an adult's iPhone, it's likely that streaming Spotify directly from the iPhone to the child's watch would not be possible, especially if the watch is designed to operate independently of the phone. Additionally, for streaming to work, the child's watch would indeed need to be in proximity to the adult's iPhone, which could be impractical or defeat the purpose of the child having a standalone device.

Therefore, while the watch can have its own cellular connectivity and potentially run apps independently, the specific functionality of streaming from Spotify on an adult's iPhone to a child's watch set up through Family Setup might be limited or unavailable.