Has Editing Autosave Frequency Stopped Working?

Hi all

I've tried to look for a thread on this, but can't see the answer any-where.. So, I've changed the frequency of the autosave using the config file as recommended by every-one to 30 mins (also tried 40, 60 and 120 mins), but the game is still saving every 10. Is there something else I need to do other than changing the number of seconds in the config file or has this stopped working altogether?
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