Hi, I just managed to get to the bottom of this as I was facing the same issue - altough on a Sony phone. So, the main issue is, when you believe your old phone is syncing data and saves it in the cloud - actually it isn't. And no - there is no error message. It is easy to check - connect your old phone to Wi-Fi (assuming the sim is in the new phone) and try to sync from the Samsung health app manually. Click the 3dots on the top righ, then select setting from the drop down. Click samsung account and Sync Now. If it returns with an error message (e.g. log into samsung account to sync) it is not syncing. - And probably not ever synced. So, what you need to do is to back up your SHealth data from the old phone. Unfortunately, as the sync does not work it is not straight forward. I started with removing the samsung Health app from the new phone, until you back up the old one. (on your new phone go to settings/apps and notifications/app info - find the samsung health app and click on it, then click uninstall. Put your new phone on the side for now. Then login to your samsung account on a computer and change your password. (https://account.samsung.com). Once your password is changed you need to delete your samsung account from your old phone. Make sure you do not uninstall the SHealth app! (depends on the phone, but it is usually under settings/users & accounts. Find "Sync Samsung Health with Samsung account". Click on it and remove. Once it is removed you can add the same account again through the same way settings/users & accounts - add the bottom click - add account. Once you typed in your email and new password go back to the Samsung app and Sync manually. This will take a while as probably your phone hasn't sync since the first install of the Samsung Health app. Once the sync is complete on your old phone, you can download the Samsung Health app again on the new phone and login. On the bottom of the app you will see a message saying updating data. Now I have all last years activity on my new phone and hope you will manage to get it as well.
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