The release version 5.2.5 on Android can't be connected to Google Fit. I tried the support article here and disconnected every connection, logged off and on. No change. I then tried the beta version v.5.3.0.. here I get the Google Popup during authentication "Authentication with Google for this app is temporarily deactivated. The use of Google Log-in wasn't approved for this app yet."
This whole situation is going on for a while now, just look at all those other entries here. I want to export weight and other withings metrics to Google Fit. Please devs.. have a look at it.