How can I prevent Apple Music from opening on Bluetooth calls?

Have you tried noTunes?

"noTunes is a macOS application that will prevent iTunes or Apple Music from launching. Launch the noTunes app and iTunes/Music will no longer be able to launch. For example, when bluetooth headphones reconnect. You can toggle the apps functionality via the menu bar icon with a simple left click."

https://github.com/tombonez/noTunes

jeffry174 Said:

"How can I prevent Apple Music from opening on Bluetooth calls?:i can't stop apple music from opening whenever i make a call using my bluetooth headset [paired with both computer and phone"

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Bluetooth and Apple Music:

Seems to be a device confliction here. Bluetooth is one-device only. You cannot connect a Bluetooth device to multiple devices at once. So, close Apple Music, if it is opening.