not sure whats going on there, but it reminds me of a post by @Damian_Broj_oldaccount about different types of hyphens causing issues in Anaplan:
in this post, Damian mentioned that different software (Such MS Word) can generate dashes which look identical but are different symbols in reality. It seems to be the case here and eprhaps he could offer more guidance here.
A potential workaround that I can suggest for this is to save the source file as .txt instead of .csv (more specifically as "Unicode text") and then, when loading the data file into anaplan, selecting UTF-16LE as Text Encoding. That should help you to get rid of the special characters that may be causing your error.