Sign out of the Apple Music app
Open the Apple Music app on your Android phone and sign out of your Apple account. Do not sign back in yet. WalkAmp will handle that in step 3.
Open WalkAmp and go to My Music
Open WalkAmp and tap the My Music tab.
Tap the Apple Music button
This launches the Apple Music app on a screen that says Connect Apple Music to WalkAmp. Tap Connect to Apple Music and sign in with your Apple account.
Look for the check mark
Once you have logged in, WalkAmp brings you back to My Music. The Apple Music row should now show a check mark and say Connected — full songs enabled, like this. You're set: WalkAmp can play full Apple Music tracks.