first, I am not a native Spanish speaker, but I asked friends who are speaking Spanish, before posting here. I would like to point to a possible problem.
Switching Excel-Insider to Spanish (Language Pack), shows me the following translations for SINGLE and UNIQUE. They have been translated into ÚNICO and UNICO. According to my friends, único should have an accent, and in that case, e.g. both English functions would have the same translation. Can your Spanish moderator please have a look? Thanks :)