More than 1 device is trying to play music.

So I left my iTunes playing Music in my office and ran out the door with my iPhone. Now I’m trying to play music in the car. But I get this message with “More than 1 device is trying to play music.” So how do I get the iTunes to stop playing and have my IPhone take over? I do not need a Family account as no one is listening to music in my office. I’m travelling with my IPhone and just want to listen from that device now!

I should be super easy to just take over the most reason play action and let that device play the selected music - right?