Godot 4.5: Godotx-Firebase fails to detect google-services.json

Godot Version

4.5

Question

I’m developing a game and need to implement Firebase push notifications using the Godotx-Firebase plugin. However, I’m running into an issue where the plugin fails to read my google-services.json file. I’ve already configured the file path in Project > Export to both res:// and res://android/build/, but it still won’t work. Does anyone know how to properly link this file or fix this initialization error?
I’m following these steps: GitHub - godot-x/firebase: Modular Firebase integration for Godot with support for iOS and Android

#FirebaseService.gd

extends Node

var firebase_core
var messaging

func _ready() -> void:
	print("Init firebase service...")
	# Get all singletons
	if Engine.has_singleton("GodotxFirebaseCore"):
		print("Found GodotxFirebaseCore")
		firebase_core = Engine.get_singleton("GodotxFirebaseCore")
		firebase_core.core_initialized.connect(_on_core_initialized)
		# Initialize Core first
		if firebase_core:
			firebase_core.initialize()
		

func _on_core_initialized(success: bool):
	if success:
		print("Firebase Core initialized!")
		
		#messaging
		if(Engine.get_singleton("GodotxFirebaseMessaging")):
			messaging = Engine.get_singleton("GodotxFirebaseMessaging")
			# Connect to signals
			messaging.messaging_permission_granted.connect(_on_permission_granted)
			messaging.messaging_token_received.connect(_on_token_received)
#			messaging.messaging_apn_token_received.connect(_on_apn_token_received)  # iOS only
			messaging.messaging_message_received.connect(_on_message_received)
			messaging.messaging_error.connect(_on_error)
			# Request notification permission (this also registers for APNs on iOS)
			messaging.request_permission()
			# Get FCM token
			messaging.get_token()
			# Get APNs token (iOS only - call after request_permission)
			#if OS.get_name() == "iOS":
			#	messaging.get_apns_token()
	else:
		print("Firebase Core initialization failed")


func _on_permission_granted():
	print("Permission granted!")

func _on_token_received(token: String):
	print("FCM Token: ", token)

func _on_apn_token_received(token: String):
	# iOS only - Apple Push Notification device token
	print("APN Token: ", token)

func _on_message_received(title: String, body: String):
	print("Message: ", title, " - ", body)

func _on_error(message: String):
	print("Error: ", message)

**Output
**
Init firebase service…
Found GodotxFirebaseCore
Firebase Core initialized!
Permission granted!
Error: Default FirebaseApp is not initialized in this process com.package.mygame. Make sure to call FirebaseApp.initializeApp(Context) first.