Apple started phasing out Dashboard in Mac OS X 10.10 (2017), and removed it in macOS 10.15 (2019). As a result, we have been winding down support for our Dashboard widget as well. We will continue to release service updates with fixes for minor issues, but over time some services will no longer be supported. When you see the message “this shipment can only be viewed online” that means the service is no longer supported. You can still click on the delivery to open a web page, where you can check the status manually.
We recommend switching to our full Deliveries app for Mac if possible. See here for a list of currently supported services.