Soundboard with SONOS SYMPHONISK

I have 2 SONOS SYMPHONISK coupled stereo. All my flows using “play Soundboard sound” card is working but only on the left speaker. No stereo. No sound on right speaker.
If my sound file is stereo, only left track is listened. there is no parameter.
I need to keep speakers paired because I listen music.

Any help would be welcome.


Same problem here, just tested with a stere .mp3-file. 2 Ikea «book shelf» paired in Sonos.

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