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The RAI Italian services seems to work initially then stops working.
I have tried this from an iPad running the oeck client and using safari to get to https://www.raiplay.it. Once signed in I can stream. If I stop the stream and re-start I receive an error and the stream no longer works.
I have had similar issues with the android RaiPlay for android TV app sideloaded onto a nvidia shield TV pro. ie stream initially works then stops working.
Not sure if there is anything that can be done from your end?