Can see airplay, but no sound output

[HeyMrPolarBear]

I found the solution to my problem here

Airplay not showing up on Pi2 / 0.6RC

Hi there. There is a known problem with Airplay devices (not just Shairport Sync but airplay devices in general) taking a long time to show up. See https://github.com/mikebrady/shairport-sync/issues/15 for a thread of discussion about it.