Unity augmented reality app doesn't work on android

I am pretty new to unity and augmented reality applications. I use unity 2019.4.4f1 and my project is very simple as you can see in the screenshot below:

I am using Wikitude plugin for image tracking and the image i am using as the marker is the Jack of Clubs card as you can see in the assets. The project works fine when i press play and use my laptop’s webcam , but when i build the project for android (unity 2019 automatically uses Gradle to build the project) and install the .apk file in my android phone, all i see on my phone screen when i open the application is:

As you can see the phone camera doesn’t work and it gets stuck in this screen. How should i fix it? Does it have to do something with Gradle? I haven’t tried using unity version 2018 to build it using the "Internal" build option. Anyways that’s just my own thought and i might be wrong, but the final question remains which is how this problem can be fixed?

By the way i don’t build the .apk file directly from the unity engine. I use the export option in unity to get a gradle project folder then i use that in Android Studio to build the final .apk file. The reason that i don’t use unity to build .apk is that it gives errors and doesn’t work for me so this is the solution i found for it.

Update: I debugged the application and it seems that the application needs camera permission to work, this is my debugging log:

07-22 17:47:16.908: E/Unity(32483): On Camera Error
07-22 17:47:16.908: E/Unity(32483):         Error Code: 1000
07-22 17:47:16.908: E/Unity(32483):         Error Domain: com.wikitude.camera.android
07-22 17:47:16.908: E/Unity(32483):         Error Message: Permission denied. Make sure to have camera permissions before trying to access the camera.
07-22 17:47:16.908: E/Unity(32483):  
07-22 17:47:16.908: E/Unity(32483): (Filename: ./Runtime/Export/Debug/Debug.bindings.h Line: 35)

I’m pretty sure that it didn’t ask for camera permission, how should i allow the permission if it’s not asking?

#if PLATFORM_ANDROID
    if (!Permission.HasUserAuthorizedPermission(Permission.Camera))
    {
        Permission.RequestUserPermission(Permission.Camera);
    }
#endif