1. Spriv supports authentication via SMS and TOTP. So, in the worst case you can always access your server via TOTP, even if your mobile phone has no internet connection at all, and no carrier reception.
  2. Ensure that your mobile phone has a good internet reception to your carrier or connect to a fast WiFi. Push notification is a service provided by Apple, Google and works over the internet, without a good internet connection to your mobile phone, the push notification does not work well.
  3. Did you pair your mobile phone? How to send a pairing link or code:  
  4. Example how paired account looks like: