Try unplugging the Era 300 from power for a couple of minutes and reboot your phone. Also make sure the Spatial Music setting is enabled in the Sonos app. Then test the song “Staircase” by Steven Wilson.

Thanks, it helped! However, when I play with both Era 300 + Port, Dolby Atmos is not available. Too bad, might this be an issue or a feature? Had not noticed this earlier.

I don’t think Port supports Atmos, so when you group it in with the Eras it reverts down to stereo. 

Thanks, I assumed that with music only the Era 300 would play Dolby Atmos and the Port stereo stream. That would be a nice feature, I hope it is added in the future.

Apparently the same would happen with Era 100s as well, surprising tbh.

Thanks for all the replies!

Went to look at the Era 100 docs, seems copy-paste is disabled there so I grabbed a screenshot.