Normally it shoud work. Mine and the data of my wife work flawlessly. I would suggest to delete the Withings-App on Homey an reinstall. After that you have to configure the app before you can use it. There you have to allow Homey to fetch your data of Withings. Afterwards you can install a new device Withing user. This should communicate with your sleep analyzer. It shows me when I went to bed or when I get off the bed in the timeline. Steps from my Galaxy Watch 6 which is connected to Withings are not shown in Homey though.