The issues with Apple TV are discussed here – https://forums.trakt.tv/t/apple-tv-disappeared-on-automatic-streaming/89113/5. Basically we’re waiting for the third party service we use for automatic tracking to make a change on their end.
If you’re having issues with other streaming services, please send a dm to support with a few specific titles that haven’t synced, the service they were watched on, and a rough estimate when they were watched so we can look into it.