I know this is an old thread, but it is one that really bears some thought on both Garmin and Withing Sides. I know it is possible to sync all the data from Withing scale to Garmin Connect. I use https…
I'm wondering if it's just a typo or a misunderstanding when they wrote "to transfer the data to MyFitnessPal"...?
Before buying the Garmin index scale, for several years I was using MyFitnessPal to sync withngs scale data to Garmin Connect. The process was quirky at best. Not sure if it will help here, but in the past it was a matter of disconnecting MFP and Garmin Connect then reconnecting - Weight not syncing from MyFitnessPal
That was the recommendation from Garmin when I opened my original ticket and it worked. When it stopped last week and that disconnect/reconnect didn't work, Support suggested I also do a reset on the iPhone. All that did was bring in that day's weigh-in. It didn't fill in the missing weights nor continue to sync the next. When I replied with that info and mentioned that members on the forum were experiencing the same issues, the above was their latest reply. :(
Now I manually disconnect/connect between MFP and GC everyday...
I use this: https://github.com/jaroslawhartman/withings-sync
Every morning after I weigh myself, I run a command that syncs it to garmin connect. I also sync to MFP which used to cause a duplicate being sent to garmin every day which I deleted. I noticed that stopped a week or two ago.