FLAC availability depends on multiple external factors:
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whether Spotify’s lossless tier is available in your region,
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whether it is enabled on your account,
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and which Spotify client is used for playback.
Spotycast does not “force” lossless playback.
Instead, it is designed to avoid unnecessary transcoding when lossless audio is already available from the client.
If the upstream Spotify client does not deliver lossless audio, FLAC output will not magically appear downstream.