I have exactly the same problem, but couldn`t find a workaround.
iasAppdeveloper
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For me its the same issue for Iphone X I'm unable to download any restore image for ios or ipados.All of them give me "Acces Denied" as descriped by the thread starter.Did anyone succesfully download an image? Maybe through another acount or something. That would limit the problem to be an account spezific problem.