Hey jkcdn, thanks for getting back to us here in Communities.
Are you using this method to cast? Use Apple Music with your Android devices - Apple Support
"Stream music from Apple Music to your Chromecast device
- Make sure that your Android device and Chromecast device are connected to the same Wi-Fi network.
- Open the Apple Music app.
- At the top of your screen, tap the Cast button .
- Tap your Chromecast device.
- Play music.
If you need help with your Chromecast, visit Google Support.
Not all content types in Apple Music support Casting, and not all Chromecast devices are supported."
Make sure all steps are followed here from Google for using cast: https://support.google.com/googlenest/answer/7181830?co=GENIE.Platform%3DiOS&oco=0
"Step 1. Cast from Chromecast-enabled apps to speaker or display
- Make sure your mobile device or tablet is connected to the same Wi-Fi network or linked to the same account as your speaker or display.
- Open a Chromecast-enabled app.
- Tap the Cast icon .
- Touch and hold the tile of the speaker or display you'd like to cast to.
- When you're connected, the Cast icon will turn from light to dark gray, and will let you know you're connected.
- You can now cast audio and video to your speaker or display from your device.
- To stop casting, at the top of your device's screen, tap the Cast icon . In the box that appears, tap Stop Casting.
Note: Some music providers, like Spotify, require a subscription to play music from its Chromecast-enabled app. Also, YouTube content is only supported from the YouTube Music app (not the YouTube app), and you must have a YouTube Premium account. YouTube Music is only available in the US and Australia.
As mentioned previously, if you need further help contact: Google Support
Best regards.