I've never noticed a fragrance on Cots before, but their cousins the Kalanchoes (some very fragrant) and the Crassulas (one or two are pleasant, but there are many which are unpleasantly funky).

Not sunny and being indoors will inhibit flowering, but I don't think it would prevent it. I don't know if it will be fragrant when the flower is open, but if the Internet is where you got the idea of it being fragrant, it must be true, right?

Thanks for the comments. Actually, people claim the plant is fragrant. I will have to wait and see.

It might depend on your smeller (nose). Some folks can detect aromas, others have difficulty.