@acrylamid said:
Trakt.tv import doesn't work
Hi.
Tried to import my data from trakt.tv.
No editing done at all, but it doesn't work.
I also tried to just export my movies but that didn't help.

It is possible that trakt.tv made some changes to the list format in .CSV.
I suggest that you first make a comparison with the two trakt.tv models accepted here by TMDb.
Download both files and verify that the header and data obey the same rules.
https://www.themoviedb.org/settings/import-list