FAQ Syncing - trakt/Plex-Trakt-Scrobbler GitHub Wiki
"Full" and "Quick Pull" syncs only imports changes to your Trakt.tv profile, run a "Pull" sync instead to import everything from your profile.
Ensure you are using a supported metadata agent listed here.
Ensure the Global Filter - Libraries
option isn't excluding your library from syncs.
Ensure you are using a supported metadata agent listed here.
Search for the error in the Knowledge Base for more details, if you can't find the error listed post an issue here instead.