I finally got mine working. I found that the issue was with the way the External URL is setup for withings to work properly. I had to manually set the “Home Assistant URL” in the Settings->System->Network. Before I had the internet checked to use Home Assistant Cloud as I subscribe to NabuCasa. However, this wasn’t allowing withings to work. So I unchecked the box and manually entered the webaddress for my NabuCasa account. I rebooted and withings started working properly. It now reports the in_bed sensor data correctly.