Immediately after „dividing“ the taxcard (= sending the taxcards to the individual recipients), a dialog box will open informing you that a PIN must be passed on. At the bottom you will see a sequence of digits (e.g. 12345678-123456-1234-1) which represents the tax ID. This was sent to the recipient by mail. To the right you will find the PIN. You have to give this to the recipient separately. In the same window you will also find your PIN. You forward this to the recipient(s). Without entering the PIN, the taxcard will not be visible on the recipient’s device.