I've posted the same problem. Several websites are now reporting this issue. Amazon Help web page shows that 5.1 audio for Apple TV is "coming soon." One would have expected that Amazon would have figured this out ahead of the release. From Amazon Help:
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| Apple TV |
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- Streaming Video Quality: SD, HD, and UHD/HDR (Apple TV 4K only)
- Download Videos: No
- Purchase Videos: No
- Parental Controls: Yes
- Subtitles : Yes
- Audio Descriptions: Yes
- Watchlist: Yes
- Auto Play: Yes (Next Up and Recommended titles)
- 5.1 Audio: Coming soon
- Live Streaming (Thursday Night Football): Yes, Apple TV 4K and Apple TV (4th generation) only
- Live Streaming (Amazon Channels): Yes, Apple TV 4K and Apple TV (4th generation) only
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