Rooted android device but getting "Security exception: Permission Denial: not allowed to send broadcast android"

I've got a nexus 6P running stock Android 8.1 which is rooted using Magisk (verified by runnign adb shell su). When turning airplane mode on/off using adb (as per these instructions: https://stackoverflow.com/a/40271379) the following exception is returned: $ adb shell settings put global airplane_mode_on 1 $ adb shell am broadcast -a android.intent.action.AIRPLANE_MODE Broadcasting: Intent { act=android.intent.action.AIRPLANE_MODE flg=0x400000 } Security exception: Permission Denial: not allowed to send broadcast android.intent.action.AIRPLANE_MODE from pid=6484, uid=2000 java.lang.SecurityException: Permission Denial: not allowed to send broadcast android.intent.action.AIRPLANE_MODE from pid=6484, uid=2000 at com.android.server.am.ActivityManagerService.broadcastIntentLocked(ActivityManagerService.java:19204) at com.android.server.am.ActivityManagerService.broadcastIntent(ActivityManagerService.java:19842) at com.android.server.am.ActivityManagerShellCommand.runSendBroadcast(ActivityManagerShellCommand.java:621) at com.android.server.am.ActivityManagerShellCommand.onCommand(ActivityManagerShellCommand.java:154) at android.os.ShellCommand.exec(ShellCommand.java:96) at com.android.server.am.ActivityManagerService.onShellCommand(ActivityManagerService.java:15021) at android.os.Binder.shellCommand(Binder.java:594) at android.os.Binder.onTransact(Binder.java:492) at android.app.IActivityManager$Stub.onTransact(IActivityManager.java:4243) at com.android.server.am.ActivityManagerService.onTransact(ActivityManagerService.java:2919) at android.os.Binder.execTransact(Binder.java:697) What needs to happen for adb to be able to turn airplane mode on and off?