1. Incomplete data transmission: During migration, data may be lost or transmitted incompletely, resulting in some data not being successfully transmitted to the new device. You can try to migrate the data again.
2.Apple ID change: If you reset iWatch on a new device and use a new Apple ID, the original data may be lost or confused. In this case, you can try to restore through iCloud backup.
3. Data not backed up before migration: If iWatch data is not backed up in time before migration, the original data cannot be recovered even if it is migrated to a new device. Therefore, data backup before migration is strongly recommended.
If you still can't get the medal back, you can contact Apple's official customer service to seek a more professional solution.