To activate AirPlay mirroring on iOS follow these instructions:
- Go to your device and open the command Center by swiping down from the top right of the device.
- Press the AirPlay button in the playback area.
- Select the device to which to transmit to.
- Verify that you see the tick mark on your screen. The music should be playing normally.
If you have a Sonos device, the connection should be done with Airplay 2. See documentation.