Apps using the background audio mode with the common audio modes cannot actually update live activites; an update silently fails; they do not update nor do they throw an error.
This is mentioned in this thread: https://developer.apple.com/forums/thread/716458 and I have confimed the behavior. This is contrary to the documentation which implies any backgrounded app can update the activity, and has wasted a lot of peoples' time, especially since it doesn't throw an error, it just doesn't work.
Workarounds would be to use an unnecessary background mode like location, or spam push notifications which will update the live activity widget as long as the user receives them.
Topic:
Privacy & Security
SubTopic:
General
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