LPCM 7.1 instead of Atmos

When playing Atmos content from SMB on the Apple TV 4K (latest gen), my sound bar (Bose 900) software shows that content in LPCM 7.1 format, instead of Atmos. How can I fix it?
Thank you

What is the source format? Apple TV can only output lossy EAC3 (DD+ Atmos) and not lossless Dolby TrueHD+Atmos as an Atmos signal. Otherwise it is converted

Oh, I understand. Thanks a lot!

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