Have you tried solving it using the Samsung multiroom app? Go to 'speakers' on the app. Select soundbar and choose 'source' (third option) and choose [TV] Samsung 9 series (wifi)? Also make sure you update your speakers via your settings on the multiroom app. On your tv: try going to your sound settings, choose 'select speaker' (it's soundbar wifi). Also make sure you update speakers via your setting on the multiroom. All my speakers work via wifi and it works great as long as you keep udating it regularly (weekly) via the settings on the multiroom app.
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