You can check to make sure your device has access to all of the required internet services by using the network checking application. These provide updates on rate information, sync your transaction data, and refill postage funds for the Envelope Printing and Trackable Labels applications.
If your device is behind a firewall, you may need an IT professional or someone who has access to your network configuration to provide access to these services.
Open and run network checking application:
UPDATED: February 10, 2021