Can not revoke admin to uninstall testdpc

[scruel]

$ dpm remove-active-admin com.afwsamples.testdpc/.DeviceAdminReceiver
Exception occurred while executing 'remove-active-admin':
java.lang.SecurityException: Attempt to remove non-test admin ComponentInfo{com.afwsamples.testdpc/com.afwsamples.testdpc.DeviceAdminReceiver} 0
        at com.android.server.devicepolicy.DevicePolicyManagerService.lambda$forceRemoveActiveAdmin$10$com-android-server-devicepolicy-DevicePolicyManagerService(DevicePolicyManagerService.java:3593)
        at com.android.server.devicepolicy.DevicePolicyManagerService$$ExternalSyntheticLambda132.runOrThrow(Unknown Source:6)
        at android.os.Binder.withCleanCallingIdentity(Binder.java:427)
        at com.android.server.devicepolicy.DevicePolicyManagerService$Injector.binderWithCleanCallingIdentity(DevicePolicyManagerService.java:1581)
        at com.android.server.devicepolicy.DevicePolicyManagerService.forceRemoveActiveAdmin(DevicePolicyManagerService.java:3589)
        at com.android.server.devicepolicy.DevicePolicyManagerServiceShellCommand.runRemoveActiveAdmin(DevicePolicyManagerServiceShellCommand.java:280)
        at com.android.server.devicepolicy.DevicePolicyManagerServiceShellCommand.onCommand(DevicePolicyManagerServiceShellCommand.java:93)
        at com.android.modules.utils.BasicShellCommandHandler.exec(BasicShellCommandHandler.java:97)
        at android.os.ShellCommand.exec(ShellCommand.java:38)
        at com.android.server.devicepolicy.DevicePolicyManagerService.onShellCommand(DevicePolicyManagerService.java:9900)
        at android.os.Binder.shellCommand(Binder.java:1054)
        at android.os.Binder.onTransact(Binder.java:882)
        at android.app.admin.IDevicePolicyManager$Stub.onTransact(IDevicePolicyManager.java:6054)
        at android.os.Binder.execTransactInternal(Binder.java:1290)
        at android.os.Binder.execTransact(Binder.java:1249)

$ dpm set-device-owner com.afwsamples.testdpc/.DeviceAdminReceiver
Exception occurred while executing 'set-device-owner':
java.lang.IllegalStateException: Trying to set the device owner, but the user already has a profile owner.
        at com.android.server.devicepolicy.DevicePolicyManagerService.enforceCanSetDeviceOwnerLocked(DevicePolicyManagerService.java:9560)
        at com.android.server.devicepolicy.DevicePolicyManagerService.setDeviceOwner(DevicePolicyManagerService.java:8393)
        at com.android.server.devicepolicy.DevicePolicyManagerServiceShellCommand.runSetDeviceOwner(DevicePolicyManagerServiceShellCommand.java:259)
        at com.android.server.devicepolicy.DevicePolicyManagerServiceShellCommand.onCommand(DevicePolicyManagerServiceShellCommand.java:89)
        at com.android.modules.utils.BasicShellCommandHandler.exec(BasicShellCommandHandler.java:97)
        at android.os.ShellCommand.exec(ShellCommand.java:38)
        at com.android.server.devicepolicy.DevicePolicyManagerService.onShellCommand(DevicePolicyManagerService.java:9900)
        at android.os.Binder.shellCommand(Binder.java:1054)
        at android.os.Binder.onTransact(Binder.java:882)
        at android.app.admin.IDevicePolicyManager$Stub.onTransact(IDevicePolicyManager.java:6054)
        at android.os.Binder.execTransactInternal(Binder.java:1290)
        at android.os.Binder.execTransact(Binder.java:1249)