I have the same issue. I deleted the Fit 2 from all my accounts a year ago and got the Gear S3. The S3 is tracking everything else like Sleep, etc and syncs those with Samsung Health.. But Samsung Health will not show the S3 as my step tracker. . I did a backup of the data and watch and have even erased and started over. . As soon as I sync everything, it tries to track steps with the Non-Existent Fit2 again.
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