Which of the following screens do you see? Follow the steps according to the screen you see.
If you see this screen, select Edit billing and payment.
If you see this screen:
a) Select Manage plan.
b) In the next screen, select Manage payment.
In the pop-up window, select Edit.
In the Edit payment method window, update your tax identification number in the tax ID field. The name of the field depends on the tax identification number applicable in your country, for example, VAT ID or GST ID.