JwtAuth is not generating tokens in Backpack Laravel - laravel

Question

I am using backpack laravel. Though I am also using Backpack's own authentication, yet I need to maintain a different customer table for App usage. For the customer table, I am using JWTAuth for token generation, but token generation gets failed each time.
public function register(Request $request)
{
$checkEmail = Customer::where('email', $request->email)->first();
if ($checkEmail) {
$response = [
'email_already_used' => true,
];
return response()->json($response);
}
$payload = [
'password' => \Hash::make($request->password),
'email' => $request->email,
'first_name' => $request->first_name,
'last_name' => $request->last_name,
'auth_token' => '',
];
try {
$user = new \App\Models\Customer($payload);
if ($user->save()) {
$token = self::getToken($request->email, $request->password); // generate user token
if (!is_string($token)) {
return response()->json(['success' => false, 'data' => 'Token generation failed'], 201);
}
$user = \App\Models\Customer::where('email', $request->email)->get()->first();
$user->auth_token = $token; // update user token
$user->save();
$response = [
'success' => true,
'data' => [
'id' => $user->id,
'auth_token' => $token,
'first_name' => $user->first_name,
'last_name' => $user->last_name,
'email' => $user->email,
],
];
} else {
$response = ['success' => false, 'data' => 'Couldnt register user'];
}
} catch (\Throwable $e) {
echo ($e);
$response = ['success' => false, 'data' => 'Couldnt register user.'];
return response()->json($response, 201);
}
return response()->json($response, 201);
}
I believe there might be some issue with guards.
Do I need to specify something in app/config.php for this?