When you attempt to make a sale and receive a notification that your VFD is blocked, please be aware that your machine has been blocked by the Tanzania Revenue Authority (TRA) due to various reasons. You can check the notification tab to see the message and the command that triggered the block. Additionally, you can contact the TRA for more information.
It's important to note that when your machine is blocked, you should visit the TRA to understand the root cause of the block. The TRA is also responsible for unblocking your machine.