Spotify on Omni s2 Issue

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Hey,

I am just trying to get some help setting up Spotify via the Polk app.
Currently I have Pandora Radio (and other music services) working without an issue, but for some reason cannot get Spotify to detect the speaker groups (or individual speaker).

I have three of Omni s2 linked and working on the same network. I have tried running the app on both iOS and Android. Both the Polk app and speakers are running the latest versions.

Any help or suggestions would be greatly appreciated.