A first user device can receive a communication certificate associated with a user of the first user device. The communication certificate can allow the first user device to exchange certain information with a second user device that also possesses the communication certificate. The first user device can receive a notification. The first user device can also determine that a second user device associated with the user did not receive the notification. The first user device can initiate a direct connection with the second user device. The first use device can verify that the second device possesses the communication certificate. After verification, the first user device can send the notification to the second user device.