Anthony,
The title of your thread here and the early initial paragraph of your post both say the TV turns on the Arc, but one part of your post then mentions things the other way around, that your Arc is switching on your TV? So it’s a little confusing?

Are you using Spotify ‘Connect’, ‘Airplay’ or ‘Bluetooth’ connection? …. and if so what is the Spotify App device list showing? - maybe a screenshot from the Apps device list, showing the connection you are using, will help.