Oil and water I'm afraid - while Alexa will support Apple Music, that's only for echo devices but not third party/Alexa-enabled devices like WiiM.
Also, Alexa groups are cloud constructs so can't take external local input (whether that be bluetooth or line in to an echo for those which support that) and re-distribute that to other devices in the group. Nor could you Airplay to a WiiM device and expect that to be sent on to echo devices in an Alexa group.
There might be a way using the Echo Link device (which is hard to come by) that may be able to re-distribute Apple Music from another echo with a line out connected to it, but that's stretching matters a bit.
Sorry, but only Amazon Music will work in the setup you describe.
Edit: or Spotify possibly, but you haven’t mentioned that…
Thanks
@Burnside for the great explanation. I was hoping you would post as you're right about these things. We'll poke around with research and try to source an Echo Link device as well as Spotify.
An AI engine suggested the following dodgy ideas which may spur some other thoughts if any look promising....thanks again for your help.
1. Bluetooth Bridging
Pair the WiiM Amp to an Echo device using Bluetooth. Once connected, the Amp can act as a Bluetooth speaker for Apple Music. However, this might still limit playback to the Amp and one other Echo device rather than the entire Alexa Group.
2. Using a WiiM Mini
Adding a WiiM Mini can bridge the gap. The Mini supports AirPlay and can output audio to an Echo device via a 3.5mm cable or stream directly to Alexa devices. This could allow her to include Apple Music in an Alexa Group, though the exact configuration might require trial and error.
3. Third-Party Skills or Alexa Workarounds
Some Alexa skills may provide Apple Music integration. Ensure her Apple Music account is linked to Alexa in the Alexa app. While Alexa natively supports Apple Music, grouping devices with the WiiM Amp might still be a limitation.
4. Using an Aux-In Workaround
If one of the Echo devices in the group has a 3.5mm audio input (like an Echo Studio or Echo Plus), the WiiM Amp or iPhone can be connected via an aux cable. This would play Apple Music through that Echo, which might then distribute audio to the group.
5. Exploring Software Solutions
Apps like Airfoil (for macOS/iOS) can stream audio to multiple devices, including AirPlay-enabled and Alexa-compatible speakers. However, this solution requires a computer or device running the software.
6. Enhanced AirPlay Integration
Look into whether the WiiM Amp firmware or app has updates that could enable better integration with Alexa Groups. Sometimes manufacturers quietly release features like improved AirPlay or multiroom support.