I bought the Withings Steel HR Sport earlier this week and have been having no end of issues. The main issue is trying to get any notifications to appear on my watch (whether they be phone, SMS, email or Whatsapp) or even getting the watch to connect when I want to change settings via Health Mate. I have followed all of the guides on the Withings website with regards to giving Health Mate the correct permissions, etc. The app runs in the background constantly so it's not like it is closing when I exit the app (I have the Health Mate icon shown in the top left corner of my phone's screen). Btw, I have an LG G6 running Android.
The only way I can get notifications on my watch is to uninstall and re-install Health Mate. I will then get notifications on my watch for a couple of hours before it loses connection and I don't get any more notifications at all from then on. The persistent Health Mate notification claims that it is connected to my watch but when I open the app, it won't sync and it really struggles to connect in order to edit any watch settings (it usually takes a number of attempts to get it to connect). Bluetooth is working fine on my phone and I have tried using various different versions of Bluetooth via the Developer Settings on my phone - but none make any difference. Incidentally, Bluetooth works fine between my phone and my car - my phone auto-connects every time I start my car without me having to do anything else.
The second issuer I have is that I cannot connect Health Mate to Runkeeper. When I select Runkeeper in Health Mate, it prompts me to login to my Runkeeper/OneAsics account in order to link the two. If I enter my username and password then I am presented with a message that as I created my account using Google, I must login using my Google account. So I click the login via Google button and it presents a 403 error explaining that Health Mate's useragent is no longer secure/supported. I have tried linking my Facebook account to my Runkeeper account and then login using Facebook when prompted by Health Mate but this doesn't work (it just returns to the login page).