bluetoothAdapter.startDiscovery() returns False always - bluetooth

Question

This is the code I'm using to try to start Bluetooth discovery. However, I always end up with the "Unable to start discovery" message (see below the code).
Device: Pixel 3 running Android 10 API 29
from grade file:
minSdkVersion 16
targetSdkVersion 30
from manifest file:
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-feature android:name="android.hardware.bluetooth" />
from java:
if (bluetoothAdapter==null)
Log.i("BT", "First must enable BT");
else
{
if(bluetoothAdapter.getState()==bluetoothAdapter.STATE_ON)
{
Log.i("BT", "BT State on");
if (bluetoothAdapter.isDiscovering()) {
Log.i("BT", "was already discovering");
bluetoothAdapter.cancelDiscovery();
}
if(bluetoothAdapter.startDiscovery())
Log.i("BT", "starting discovery");
else
Log.i("BT", "Unable to start discovery");
}
else
Log.i("BT", "BT State NOT on");
}
Thanks!

Answer 1

So despite all permissions from the manifest, the app was declined Location servces by the system and my app wasn't even listed when I was going to the Location settings in the phone menu. I had to go to the drop down menu and enable "Show system" and then a bunch of other apps with weird names appeared, among them my app. I enabled "alwasys allow" and now BT is discovering nearby devices.
How can I request this permission at runtime then so I make sure I have permission without having to go to the Settings Menu?