Uhhh, MC itself doesn't support Spotify (or have Spotify integrated) so I don't think those reports are correct at all. I would be
HIGHLY surprised if they were, and it
somehow slipped under the radar. Where's the reports at?
The only way you'd be able to get Spotify working in MC is through the WDM driver using the official Spotify app with MC's WDM driver as the output sound device in Spotify. But no, MC26 doesn't have any sort of Spotify integration (or Tidal, Qobuz, etc.).
https://wiki.jriver.com/index.php/WDM_Driver