I unpacked and set up my One yesterday.
During setup it took several attempts to connect to my local Wifi (put in the wrong password the first time) during which my phone could no longer connect to any Wifi network at all which also wasn’t resolved by rebooting the phone. (Likely unrelated but thought I would mention it).
Eventually it just started working. I could also connect the monitor to my laptop and upgrade the firmware to 3.1.13.
Integration in HomeAssistant works fine and the monitor has been providing data seemingly without any issues. It also shows in the display of the monitor. However, in the Dashboard, not a single point of data seems to have been received. I tried removing it and adding it again, but that didn’t change anything and it also still claims there is a firmware update. ‘Last seen’ in the Dashboard is the time when I (re-)added the monitor to the dashboard.