bug is kind of a strong word, it’s just a feature that isn’t there 
I’d also like to see this tackled by the way, I sort of assumed it’s there and now I am building this solution to demo for a client, and it’s going to look a bit silly that this can’t be done at the moment.
found this btw: Any way to add attendees to an outlook meeting / event - #4 by James_Hiscott