Which specific Amazon app are you asking about? Are you talking about the camera option in the Shopping app? If so, make sure both your device and the app are up to date. Does your device have a front or back camera, or both?
You may need to troubleshoot with Amazon customer service (Help>>Need More Help>>Contact Us).
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I'm being extremely clever up here and there's no one standing around looking impressed. What's the point in having you all? - Dr Who
I'm having the same problem for my S8 Active using the Amazon Underground shopping app. My app and phone are up to date but the AR View does not show up as an icon when Im in the Camera search mode. Any ideas?