diff --git a/plexpy/mobile_app.py b/plexpy/mobile_app.py
index 4d1267a1..f3c835c3 100644
--- a/plexpy/mobile_app.py
+++ b/plexpy/mobile_app.py
@@ -198,11 +198,10 @@ def validate_onesignal_id(onesignal_id):
         return 2
 
     headers = {'Content-Type': 'application/json'}
-    params = {'app_id': _ONESIGNAL_APP_ID}
 
     logger.info("Tautulli MobileApp :: Validating OneSignal ID")
     try:
-        r = requests.get('https://onesignal.com/api/v1/players/{}'.format(onesignal_id), headers=headers, params=params)
+        r = requests.get(f'https://api.onesignal.com/apps/{_ONESIGNAL_APP_ID}/subscriptions/{onesignal_id}/user/identity', headers=headers)
         status_code = r.status_code
         logger.info("Tautulli MobileApp :: OneSignal ID validation returned status code %s", status_code)
         return int(status_code == 200)
diff --git a/plexpy/notifiers.py b/plexpy/notifiers.py
index eb63df33..2029aa01 100644
--- a/plexpy/notifiers.py
+++ b/plexpy/notifiers.py
@@ -4044,7 +4044,7 @@ class TAUTULLIREMOTEAPP(Notifier):
             #logger.debug("Salt (base64): {}".format(base64.b64encode(salt)))
 
             payload = {'app_id': mobile_app._ONESIGNAL_APP_ID,
-                       'include_player_ids': [device['onesignal_id']],
+                       'include_subscription_ids': [device['onesignal_id']],
                        'contents': {'en': 'Tautulli Notification'},
                        'data': {'encrypted': True,
                                 'version': 2,
@@ -4059,7 +4059,7 @@ class TAUTULLIREMOTEAPP(Notifier):
                         "Install the library to encrypt the notifications.")
 
             payload = {'app_id': mobile_app._ONESIGNAL_APP_ID,
-                       'include_player_ids': [device['onesignal_id']],
+                       'include_subscription_ids': [device['onesignal_id']],
                        'contents': {'en': 'Tautulli Notification'},
                        'data': {'encrypted': False,
                                 'plain_text': plaintext_data,
@@ -4070,7 +4070,7 @@ class TAUTULLIREMOTEAPP(Notifier):
 
         headers = {'Content-Type': 'application/json'}
 
-        return self.make_request('https://onesignal.com/api/v1/notifications', headers=headers, json=payload)
+        return self.make_request('https://api.onesignal.com/notifications', headers=headers, json=payload)
 
     def get_devices(self):
         db = database.MonitorDatabase()