Brand new setup, Sonos One SL detected, but no audio comes out

Core Machine (Operating system/System info/Roon build number)

Win10 laptop, Dell XPS (using for initial eval of roon)
Roon SW installed here, seems to work fine, detected music and ll that.

Network Details (Including networking gear model/manufacturer and if on WiFi/Ethernet)

Wifi is on a brand new DLink COVR system. Laptop and Sono sitting on same table in front of me, hanging of single wifi AP

Audio Devices (Specify what device you’re using and its connection type - USB/HDMI/etc.)

Sonos One SL, single unit, set it up in Sonos mobile app. Roon lists the single Sonos TWICE: Once via airplay, and a second time over Roon streaming.

Description Of Issue

Audio does not play/is not audible on Sonos.

When I play to “system audio” (e.g. laptop speakers), I hear audio fine.
But when I choose Sonos, either via airplay or via roon streaming, there is no sound.
Tapping the sonos Vol Up/Vol Down buttons gives the nice bong sounds, so it is up.
Status lamp on top of sonos is solid white.

Have tried rebooting (via power cycle) the sonos,
Have tried rebooting the laptop

I can add that the while the play/pause control works as expected when Sonos is output device, the timeline does not go live. (e.g. timeline cursor does not move, elapsed time does not increment) When using system output, the timeline works properly.