Hello keaton250,
Welcome to Apple Support Communities. First, we need to make sure that the Alexa device is compatible with Apple Music. You can only listen to Apple Music with Alexa on Amazon Echo devices, Amazon Fire TV devices, and Alexa-enabled Sonos speakers such as the Sonos One that you already set up with the Amazon Alexa app on your iOS or Android device. If you are using one of these devices, follow the steps from the Apple Support article: Play Apple Music with Alexa
Set up Apple Music with Alexa
1. Open the Amazon Alexa app.
2. In the lower-right corner, tap More.
3. Tap Skills & Games.
4. In the upper-right corner, tap the search field, then enter Apple Music.
5. Tap Enable To Use.
6. Tap Settings.
7. Tap Link Account.
8. Follow the instructions to sign in with your Apple ID. Get help signing in with two-factor authentication.
If you are still unsuccessful, reach out to Apple Support for further assistance:
Get Support
We hope this helps you.