iOS Playing m4a file from internet fails with error code 1

When I attemp to play a file obtained from internet in my app, I got this MediaError object in the Xcode console output.

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{"message":"Cannot use audio file from resource 'http://server.com/audio.m4a'","code":1}

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I change the url for security reasons, but on android it plays just fine, with the code and same url.

 

I'm using latest stable version 5.0.2