Ask for Location permission at the start of the App

I am using Mapbox which shows the Users location on a Map. When I open the scene on an Android device (Samsung S8) it requests the permission but when you press Allow, it loads a grey screen. The rest of the assets are there (GUI) but it looks like the Map hasn't initialized. if I close the App and reopen it, the Map now works. Testing it on iOS, it all works fine.

I thought that if I could get the permission to come up when you first open the App - as opposed to when you open the Map scene - that it would have time for the Map to initialize.

Does anyone know how I can solve this issue?

I have this script on the Camera in the Map scene:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Locating : MonoBehaviour
 {
     private Vector2 targetCoordinates;
     private Vector2 deviceCoordinates;
     public static float lat;
     public static float longi;
     private bool ready = false;
 
     private void Start(){
         StartCoroutine(StartLocationService());
         StartCoroutine(updateGPS());
     }
     public IEnumerator StartLocationService(){
         if (!Input.location.isEnabledByUser){
             Debug.Log("User has not enabled GPS");
             yield break;
         }
         Input.location.Start();
         int maxWait = 20;
         while (Input.location.status == LocationServiceStatus.Initializing && maxWait > 0){
             yield return new WaitForSeconds(1);
             maxWait--;
         }
         if (maxWait < 1){
             Debug.Log("Timed out");
             yield break;
         }
 
         if (Input.location.status == LocationServiceStatus.Failed){
             Debug.Log("Unable to determine device location");
             yield break;
         }
         else{
             longi = Input.location.lastData.longitude;
             lat = Input.location.lastData.latitude;
         }
         ready = true;
     }
     public IEnumerator updateGPS(){
         if (!Input.location.isEnabledByUser){
             Debug.Log("User has not enabled GPS");
             yield break;
         }
         float UPDATE_TIME = 1f;
         WaitForSeconds updateTime = new WaitForSeconds(UPDATE_TIME);
         while (true){
             /* mapScript.Refresh();*/
             longi = Input.location.lastData.longitude;
             lat = Input.location.lastData.latitude;
             SetLocation();
             yield return updateTime;
         }
     }
     void SetLocation(){
         // radius.transform.position = new Vector3(0, 0, 6);
     }
 }