I want to connect Garmin app with Loseit App but it doesnt appear in the list in the Garmin app and in the Loseit app says "error, contact Garmin"
Do you have a premium subscription for Lose It? Also note that in Garmin Connect it will be shown as "FitNow."
You do not see "FitNow" ? connect.garmin.com/.../accountInformation
I recommend reaching out directly to Product Support through their website at Garmin Support to report the issue.