As I'm not able to reply anymore on the other topic here's a copy paste below. This issue still exists and is there for years now with a period in between it did work without issues. Any update on this? I'm experiencing the exact same issue as described below with my Sonos One Gen1. I can say volume 30 instead of volume 3 or volume 50 instead of 5 etc.to have it work correctly but it's still a bit weird this hasn't been solved so far.
Info from another topic by
“For some months now I’m experiencing an issue when asking Google Assistant to set the volume of our speakers/rooms to a desired volume. This does not work properly when asking to set the volume to either level 3, 5 or 10. The other volume levels seem to work okay though, as per below list:
- “Hey Google volume 0” : room volume is correctly set to 0%
- “Hey Google volume 1” : room volume is correctly set to 10%
- “Hey Google volume 2” : room volume is correctly set to 20%
- “Hey Google volume 3” : room volume is incorrectly set to 3% (instead of 30%)
- “Hey Google volume 4” : room volume is correctly set to 40%
- “Hey Google volume 5” : room volume is incorrectly set to 5% (instead of 50%)
- “Hey Google volume 6” : room volume is correctly set to 60%
- “Hey Google volume 7” : room volume is correctly set to 70%
- “Hey Google volume 8” : room volume is correctly set to 80%
- “Hey Google volume 9” : room volume is correctly set to 90%
- “Hey Google volume 10” : room volume is incorrectly set to 10% (instead of 100%)“