The device supports Spotify Connect, but Spotify Connect does not usually transmit lossless quality, as Spotify Connect usually uses compressed formats such as 320 kbps Ogg Vorbis.

Although the WiiM Ultra has a high-quality 32-bit/384 kHz SABRE DAC and can process Hi-Res audio, the lossless quality of Spotify Connect depends on the streaming service itself, and Spotify only offers lossless streaming via Spotify HiFi (or Spotify HiFi Plus). Spotify HiFi Plus), which is not currently streamed in full lossless quality via Spotify Connect.

To summarise: The network player supports Spotify Connect, but the transmission is not in lossless quality as Spotify Connect does not offer this by default.

The AI-generated answer is incorrect. It works. Google Spotify Lossless via Connect.