code: private void registerPushServices() {
          RespokeClient activeInstance = null;
  
          // If there are already client instances running, check if any of them have already connected
          for (RespokeClient eachInstance : instances) {
              if (eachInstance.isConnected()) {
                  // The push service only supports one endpoint per device, so the token only needs to be registered for the first active client (if there is more than one)
                  activeInstance = eachInstance;
              }
          }
  
          if (null != activeInstance) {
              // Notify the Respoke servers that this device is eligible to receive notifications directed at this endpointID
              activeInstance.registerPushServicesWithToken(pushToken);
          }
      }
docs: Attempt to register push services for this device