Airplay (ShairPort) not showing up on my mac and iPhone

Hi Everybody

Im using volumio v. 1.55 on a raspberry Pi 1 -
I can playback music over the web interface and it works great!

But the pi doesn’t show up as airplay device - not on my imac nor on the iphone

I can ssh to the pi and the pi is set to a static IP address -
All Devices are in the same network
And yes airplay ist turned on :wink:

I need some troubleshooting Ideas - what can i check?

Thanks for your help in advance