ActivityKit pushTokenUpdates device support

I'm building a live activity with push token updates for my app as described in the documentation and implemented in the EmojiRangers example. The workflow is working fine for fairly new devices (iPhone > 13) - however, the asynchronous pushTokenUpdates sequence used to observe changes to the push token of a Live Activity is not getting triggered on some older devices (i.e. iPhone XR, iPad 8th Generation).

Is there a minimum device version for this sequence?

This is the code I'm using:

"--------Task--------" gets printed,

"--------PushTokenUpdate--------" does not (on older devices):

do {
    let activity = try Activity.request(
        attributes: matchAttributes,
        content: .init(state: initialContentState, staleDate: nil),
        pushType: .token
    )
    
    Task {
        print("--------Task--------")
        for await pushToken in activity.pushTokenUpdates {
            print("--------PushTokenUpdate--------")
        }
    }
} catch {
    Logger().error("Error starting LiveActivity: \(String(describing: error))")
}