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Google now is not supported everywhere.
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Here are few things:


Check what account are you signed in to google app. If your google account from an unsupported country then cards wouldn't show.
Cards also depend on your location. If you are in an unsupported country then, no cards!


If you want to enable now card in unsupported country then check below links:

Enable Now Cards: No ROOT needed

Enable Now Cards [Root Needed]