Hello! I know I am a little late, And you all may have gotten your solution already, but I recently upgraded to the note 8 and had been trying to figure this out myself. Hence,, how I came across this thread. I found that during an incoming call, you need say "Hi Bixby" then "accept" If you want to answer or "decline" If you do not. ☺ I found this by going into Bixby settings, then voice apps and services, and then choosing phone.
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