In my case, I see I was using a Teleconverter with the 100-400mm, which changed the name in the EXIV data in the raw file, and that’s why it wasn’t picked up. I don’t think I can use that correction profile, because it is designed to correct the lens without teleconverter. If I want to do corrections in darktable, I’ll think I’ll need to profile the lens+teleconverter together… :-/