I created my first character. Leveled it to lvl 50 in BfA (Kul Tiras). I took the quest The Legion Returns in SW, went to Recruiter Lee in Harbour, turn in quest, but nothing happened - Lee dissapeared (phase changed) a i no another quest.
I did not get any option as this following text says.
will give you a choice to skip the introductory quest line to the Broken Shore. If you choose to skip, you will be immediately teleported to Dalaran and you will be asked to hand in the last quest called In the Blink of an Eye —hand in this quest to receive your Dalaran hearthstone.