WireGuard as Android Device Owner

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Dear all,

I'm tryin to set up WireGuard as Android Device Owner, but it fails,
even though there's the very same code that worked with Shadowsocks
fork. Below the files samples and full error message.

Thanks!

*ui/src/main/AndroidManifest.xml
<pre>
        <receiver
            android:name=".WireGuardReceiver"
            android:description="@string/app_name"
            android:label="@string/app_name"
            android:permission="android.permission.BIND_DEVICE_ADMIN"
            android:exported="true">
                       <intent-filter>
                          <!-- This action is required -->
                           <action
android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
                           <action
android:name="android.app.action.PROFILE_PROVISIONING_COMPLETE" />
                       </intent-filter>
            <meta-data
                android:name="android.app.device_admin"
                android:resource="@xml/device_owner_receiver" />
        </receiver>
</pre>

*ui/src/main/java/com/wireguard/android/WireGuardReceiver.kt
<pre>
/*
 * Copyright © 2017-2023 WireGuard LLC. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

package com.wireguard.android

import android.app.admin.DeviceAdminReceiver

/**
 * Trivial DeviceAdminReceiver used to identify this app's device administrator.
 */
class WireGuardReceiver : DeviceAdminReceiver()
</pre>

ui/src/main/res/xml/device_owner_receiver.xml
<pre>
<?xml version="1.0" encoding="utf-8"?>
<!--
 Copyright 2015 The Android Open Source Project

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
-->
<device-admin>
    <uses-policies>
        <limit-password/>
        <watch-login/>
        <reset-password/>
        <force-lock/>
        <wipe-data/>
        <expire-password/>
        <encrypted-storage/>
        <disable-camera/>
    </uses-policies>
</device-admin>

</pre>

*Error
<pre>
root at androids ~/AndroidStudioProjects/wireguard-android # adb shell
emu64x:/ $ dpm set-device-owner com.wireguard.android/.WireGuardReceiver

Exception occurred while executing 'set-device-owner':
java.lang.IllegalArgumentException: Unknown admin:
ComponentInfo{com.wireguard.android/com.wireguard.android.WireGuardReceiver}
        at com.android.server.devicepolicy.DevicePolicyManagerService.findAdmin(DevicePolicyManagerService.java:2838)
        at com.android.server.devicepolicy.DevicePolicyManagerService.setActiveAdmin(DevicePolicyManagerService.java:3342)
        at com.android.server.devicepolicy.DevicePolicyManagerServiceShellCommand.runSetDeviceOwner(DevicePolicyManagerServiceShellCommand.java:256)
        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:9905)
        at android.os.Binder.shellCommand(Binder.java:1049)
        at android.os.Binder.onTransact(Binder.java:877)
        at android.app.admin.IDevicePolicyManager$Stub.onTransact(IDevicePolicyManager.java:6054)
        at android.os.Binder.execTransactInternal(Binder.java:1285)
        at android.os.Binder.execTransact(Binder.java:1244)

</pre>