I spent some more time trying to get sync in Marvin 3 to work under iOS 15.1. It turns out that it does sometimes work, but it's only perhaps 10% of the time. When it fails it seems to time out and then get rate limited.
This feels a bit like an iOS bug. I haven't come up with a reliable workaround. I think at this point I'm probably better off waiting for the next iOS update before trying again.
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