Can't set device owner on Samsung device with Android 11

Question

I'm trying to set my app as a device owner on the Samsung A51 with Android 11. It's a fresh device with no accounts added:

adb shell dpm set-device-owner <package>/<package>.receiver.AdminReceiver
java.lang.RuntimeException: Can't set package ComponentInfo{<package>/<package>.receiver.AdminReceiver} as device owner.
    at com.android.commands.dpm.Dpm.runSetDeviceOwner(Dpm.java:204)
    at com.android.commands.dpm.Dpm.onRun(Dpm.java:115)
    at com.android.internal.os.BaseCommand.run(BaseCommand.java:60)
    at com.android.commands.dpm.Dpm.main(Dpm.java:41)
    at com.android.internal.os.RuntimeInit.nativeFinishInit(Native Method)
    at com.android.internal.os.RuntimeInit.main(RuntimeInit.java:409)

There's an active built-in device admin:

adb shell dumpsys device_policy
Current Device Policy Manager state:
  
  
  
  Enabled Device Admins (User 0, provisioningState: 0):
    com.samsung.android.kgclient/.receiver.KGAdminReceiver:
      uid=10089
      testOnlyAdmin=false

This method works on other devices, but not on this Samsung. Why and how to fix it?

P.S. I've already read all (or almost all) similar topics on SO.

Answer 1

I think you cannot set your app as a device owner because your app not yet has device admin permission. You must set your app as a device admin, then you can set your app to be device owner. Use this command to set your app as a device admin.

adb shell dpm set-active-admin <package>/<package>.receiver.AdminReceiver

Then you can use your command to set your app as a device owner

adb shell dpm set-device-owner <package>/<package>.receiver.AdminReceiver

It works for me ^^ you can try it.